Year	Number of
1990	6603.6
1991	6884.03
1992	7219.95
1993	7569.12
1994	7925.73
1995	8475.6
1996	8920.13
1997	9317.95
1998	9717.52
1999	10004.18
2000	10145.77
2001	10289.46
2002	10398.65
2003	10486.74
2004	10606.15
2005	10720.33
2006	10769.83
2007	10817.82
2008	10818.46
2009	10731.97
2010	10696.53
2011	10591.68
2012	10750
2013	10833.8
2014	10976.7
2015	11187.22
2016	11400.53