Year	Number of
1990	200.94
1991	211.74
1992	224.11
1993	237.85
1994	252.13
1995	266.12
1996	279
1997	291.36
1998	304.19
1999	320.16
2000	336.87
2001	353.14
2002	369.11
2003	385.75
2004	405.18
2005	425.38
2006	445.72
2007	464.78
2008	484.3
2009	502.91
2010	521.8
2011	544.25
2012	570.61
2013	599.34
2014	628.42
2015	657.41
2016	688.01