• 1967 to 1969 4
• 1970 to 1974 11
• 1975 to 1979 28
• 1980 to 1984 22
• 1985 to 1989 19
• 1990 to 1994 53
• 1995 to 1999 96
• 2000 to 2004 106
• 2005 to 2009 153
• 2010 to 2014 218
• 2015 to 2018 157