Year	Number of
1990	259.91
1991	273.52
1992	306.34
1993	342.33
1994	381.84
1995	427.33
1996	441.71
1997	462.01
1998	482.11
1999	505.34
2000	529.47
2001	540.52
2002	571.71
2003	606.17
2004	647.68
2005	686.35
2006	720.38
2007	747.11
2008	779.04
2009	814.94
2010	850.66
2011	889.77
2012	934.85
2013	983.41
2014	1033.25
2015	1089.94
2016	1141.96