• 1968 to 1969 34
• 1970 to 1974 72
• 1975 to 1979 100
• 1980 to 1984 84
• 1985 to 1989 108
• 1990 to 1994 148
• 1995 to 1999 180
• 2000 to 2004 122
• 2005 to 2009 172
• 2010 to 2014 310
• 2015 to 2019 227