Year	Number of
1990	188.42
1991	200.6
1992	214.87
1993	231.1
1994	249.23
1995	269.27
1996	279.32
1997	290.06
1998	301.46
1999	313.35
2000	325.56
2001	342.57
2002	359.43
2003	376.83
2004	395.44
2005	415.86
2006	445.91
2007	480.32
2008	519.14
2009	561.92
2010	608.75
2011	640.49
2012	673.64
2013	707.96
2014	744.34
2015	783.22
2016	822.96