| | | | 1948 12 | | 1968 1970 | 1968 1973 | 1973 1976 | 1976 1981 | 1981 | 1983 | 1983 1986 | | 1986 1999 | | | | | 1999 2007 | | | 2007 2010 | | | 2010 | | | | | | | | | | | | | | | | | | | 1987 | | | | | | | | | | | | | | | | | | | | | | | | 1991 | | | | | | | | 1991 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |