Year	Number of
1990	3425.31
1991	3516.46
1992	3618.85
1993	3730.55
1994	3849.38
1995	3976.97
1996	4099.11
1997	4225.18
1998	4358.42
1999	4502.22
2000	4661
2001	4864.86
2002	5087.98
2003	5334.07
2004	5605.13
2005	5907.55
2006	6204.93
2007	6531.68
2008	6893.49
2009	7281.01
2010	7696.03
2011	7859.29
2012	8017.94
2013	8172.71
2014	8346.17
2015	8546.69
2016	8713.66