1960   4      1969   10   1        1970   5   1                                                 9        1     10         1973   7   1               1975   7                                                    1976   10   2            1     1979   5   1                                  1984           1987   7           8                                                 5500                                                                         11         75%   1997   1   1                            C   6B                                    53                                            53                                          400     600         300                                                                             3        50                                                   20                                                                                                        100                             1997      474       14                                                                           