Year	Number of
1990	2431.9
1991	2508.97
1992	2591.67
1993	2674.63
1994	2762.15
1995	2857.91
1996	2970.39
1997	3090.23
1998	3214.53
1999	3345.3
2000	3480.73
2001	3552.97
2002	3626.96
2003	3701.92
2004	3780.52
2005	3867.21
2006	3932.06
2007	3999.85
2008	4070.75
2009	4142.47
2010	4218.34
2011	4202.28
2012	4188.47
2013	4177.47
2014	4165.57
2015	4150.22
2016	4150.78