Year	Number of
1990	193.09
1991	205.47
1992	218.87
1993	233.74
1994	249.63
1995	266.77
1996	282.75
1997	299.78
1998	319.3
1999	339.81
2000	361.58
2001	378.42
2002	395.8
2003	415.47
2004	435.92
2005	457.28
2006	482.64
2007	508.44
2008	537.33
2009	566.91
2010	597.4
2011	628.16
2012	660.74
2013	696.06
2014	732.92
2015	771.3
2016	811.99