Year	Number of
1990	2091.96
1991	2112.12
1992	2140.63
1993	2158.43
1994	2189.38
1995	2197
1996	2217.13
1997	2230.56
1998	2233.05
1999	2240.29
2000	2239.59
2001	2262.39
2002	2279.5
2003	2281.41
2004	2281.99
2005	2289.14
2006	2322.24
2007	2373.15
2008	2425.23
2009	2436.99
2010	2476.27
2011	2524.25
2012	2568.01
2013	2592.79
2014	2651.86
2015	2713.02
2016	2779.03