Year	Number of
1990	1329.36
1991	1336.17
1992	1349.76
1993	1365.6
1994	1389.45
1995	1405.18
1996	1417
1997	1426.75
1998	1431.64
1999	1447.68
2000	1464.78
2001	1487.2
2002	1523.08
2003	1555.54
2004	1599.93
2005	1624.71
2006	1661.79
2007	1708.04
2008	1840.21
2009	1944.51
2010	2039.92
2011	2099.89
2012	2151.34
2013	2226.29
2014	2286.83
2015	2355.03
2016	2426.7