Year	Number of
1990	2307.05
1991	2383.47
1992	2398.53
1993	2506.61
1994	2683.4
1995	2760.69
1996	2671.09
1997	2687.12
1998	2732.74
1999	2788.35
2000	2939.27
2001	2991.37
2002	3078.16
2003	3157.67
2004	3268.56
2005	3403.59
2006	3512.23
2007	3555.56
2008	3539.73
2009	3569.93
2010	3657.31
2011	3746.15
2012	3847.4
2013	3917.31
2014	3994.33
2015	4075.03
2016	4172.97