Year	Number of
1990	1257.43
1991	1244.5
1992	1239.78
1993	1234.61
1994	1240.22
1995	1256.75
1996	1272.71
1997	1304.17
1998	1339.86
1999	1381.02
2000	1424
2001	1445.83
2002	1468.98
2003	1499.68
2004	1525.87
2005	1555.06
2006	1574.1
2007	1591.65
2008	1613.61
2009	1636.81
2010	1657.3
2011	1671.92
2012	1678.64
2013	1707.62
2014	1735.42
2015	1764.83
2016	1801.53