Year	Number of
1990	1358.35
1991	1427.98
1992	1507.28
1993	1596.26
1994	1694.26
1995	1801.76
1996	1911.23
1997	2031.42
1998	2161.93
1999	2303.77
2000	2457.8
2001	2554.7
2002	2658.91
2003	2768.8
2004	2884.62
2005	3007.13
2006	2967.55
2007	2928.59
2008	2895.95
2009	2872.01
2010	2858.31
2011	2985.05
2012	3128.53
2013	3284.94
2014	3449.02
2015	3617.8
2016	3785.17