Year	Number of
1990	3331.81
1991	3391.99
1992	3453.46
1993	3513.49
1994	3573.39
1995	3639.13
1996	3706.62
1997	3778.36
1998	3854.45
1999	3931.22
2000	4010.72
2001	4061.43
2002	4112.52
2003	4167.83
2004	4227
2005	4290.5
2006	4337.58
2007	4385.02
2008	4434.29
2009	4483.87
2010	4536.22
2011	4521.88
2012	4508.13
2013	4491.88
2014	4477.59
2015	4473.6
2016	4470.86