Year	Number of
1990	415.57
1991	429.55
1992	442.64
1993	450.49
1994	457.49
1995	464.47
1996	479.04
1997	484.47
1998	492.46
1999	502.2
2000	501.78
2001	511.36
2002	520.45
2003	531.09
2004	543.09
2005	555.83
2006	574.68
2007	586.55
2008	595.19
2009	608.28
2010	621.85
2011	627.63
2012	640.62
2013	645.2
2014	652.4
2015	648.15
2016	652.02