| | | | | | | | | | 1968 10 | | | | | 1988.09-1990.07 | | 1990.08-1996.05 | | 1996.05-1996.10 | 1995.03-199.09 | | | 1996.10-1999.11 | | 1999.11-2002.03 | | 2002.03-2004.06 | | 2004.06-2007.10 | | 2007.10-2012.10 | | 2012.10-2017.07 | | | 2017.07- | | |