Year	Number of
1990	443.21
1991	467.11
1992	486.24
1993	503.75
1994	529.09
1995	549.83
1996	568.3
1997	583.56
1998	594.29
1999	615.34
2000	639.4
2001	670.9
2002	699.78
2003	722.62
2004	746.07
2005	766.73
2006	779.91
2007	791.56
2008	827.72
2009	854.63
2010	883.41
2011	914.08
2012	948.61
2013	995.4
2014	1025.48
2015	1055.17
2016	1083.82