2018 - 2020
2017 - 2018
2016 - 2017
2013 - 2016
2011 - 2013
2010 - 2011
2008 - 2010
2006 - 2008
2004 - 2006
2002 - 2004
2001 - 2002
1999 - 2001
1997 - 1999
1996 - 1997
1993 - 1994
1994 - 1996
1991 - 1993
1990 - 1991
1988 - 1990
1987 - 1988
1986 - 1987
1985 - 1986
1984 - 1985
1982 - 1983
1981 - 1982
1980 - 1981
1978 - 1980
1975 - 1978
1974 - 1975
1973 - 1974
1972 - 1973
1971 - 1972
1968 - 1971
1967 - 1968
1964 - 1967
1963 - 1964
1960 - 1963
1959 - 1960
1956 - 1959
1954 - 1956
1953 - 1954
1950 - 1953
(the first lay President)
1948 - 1950
Elected President
1939 - 1948