Year	Number of
1990	1019.82
1991	1054.35
1992	1088.88
1993	1118.36
1994	1149.06
1995	1172.25
1996	1187.44
1997	1201.81
1998	1266.44
1999	1301.32
2000	1382.28
2001	1461.43
2002	1538.48
2003	1582
2004	1661.36
2005	1742.78
2006	1828.98
2007	1936.19
2008	2040.25
2009	2167.48
2010	2316.23
2011	2399.32
2012	2460.42
2013	2514.65
2014	2521.47
2015	2511.96
2016	2515.44