- 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
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- 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
- June 2019 to May 2020 – 33,180
- May 2020 to June 2021 – Closed
- June 2021 – May 2022- 34,357
- June 2022-May 2023- 37,737
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