- June 1990 to May 1991 40,242
- June 1991 to May 1992 43,824
- June 1992 to May 1993 43,907
- June 1993 to May 1994 44,754
- June 1994 to May 1995 45,203
- June 1995 to May 1996 45,542
- June 1996 to May 1997 47,961
- June 1997 to May 1998 47,562
- June 1998 to May 1999 48,801
- June 1999 to May 2000 49,856
- June 2000 to May 2001 50,211
- June 2001 to May 2002 51,783
- June 2002 to May 2003 50,622
- June 2003 to May 2004 50,744
- June 2004 to May 2005 49,954
|
- June 2005 to May 2006 47,523
- June 2006 to May 2007 48,220
- June 2007 to May 2008 52,628
- June 2008 to May 2009 52,723
- June 2009 to May 2010 50,636
- June 2010 to May 2011 48,592
- June 2011 to May 2012 46,128
- June 2012 to May 2013 43,780
- June 2013 to May 2014 50,774
- June 2014 to May 2015 52,129
- June 2015 to May 2016 50,686
- June 2016 to May 2017 51,624
- June 2017 to May 2018 52,008
- June 2018 to May 2019 56,676
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