Year	Number of
1990	388.58
1991	404.31
1992	420
1993	434.46
1994	449.33
1995	465.04
1996	480.78
1997	497.35
1998	513.61
1999	530.93
2000	549.96
2001	567.72
2002	586.12
2003	605.14
2004	625.05
2005	646.33
2006	670.15
2007	695.67
2008	720.82
2009	747.12
2010	775.63
2011	824.48
2012	878.16
2013	939.4
2014	1007.44
2015	1082.91
2016	1165.2