Year	Number of
1990	348.91
1991	366.14
1992	384.3
1993	403.36
1994	424.11
1995	447.14
1996	473.54
1997	502.63
1998	535.92
1999	573.05
2000	614.46
2001	670.96
2002	732.62
2003	804.44
2004	881.8
2005	965.71
2006	1029.4
2007	1098.59
2008	1177.07
2009	1260.63
2010	1349.79
2011	1452.61
2012	1562
2013	1681.13
2014	1810.57
2015	1952.3
2016	2104.15