Year	Number of
1990	466.93
1991	494.01
1992	523.31
1993	555.53
1994	590.19
1995	627.52
1996	661.71
1997	697.79
1998	736.09
1999	776.29
2000	818.62
2001	851.05
2002	884.8
2003	919.93
2004	956.35
2005	994.29
2006	1040.56
2007	1088.78
2008	1139.42
2009	1192.51
2010	1248.46
2011	1292.29
2012	1338.36
2013	1386.77
2014	1436.58
2015	1487.61
2016	1539.34