| | | 1961 | 1981 8 | | | 1981.08 1991.12 | 1984.09 1987.07 | | 1991.12 1995.05 | | 1995.05 1999.10 | | 1999.10 2004.12 | | 2004.12 2007.10 | | 2007.10 2008.04 | | 2008.04 | | | | | | | | |