Year	Number of
1990	537.26
1991	581.93
1992	622.62
1993	666.83
1994	711.76
1995	756.74
1996	806.97
1997	830.27
1998	882.38
1999	912.18
2000	969.57
2001	1027.06
2002	1082.25
2003	1117.62
2004	1113.23
2005	1154.17
2006	1205.15
2007	1290.21
2008	1372.19
2009	1460.54
2010	1554.87
2011	1652.12
2012	1782.13
2013	1937.23
2014	2062.2
2015	2160.04
2016	2242.45