Year	Number of
1990	602.6
1991	618.04
1992	631.93
1993	676.07
1994	701.2
1995	742.63
1996	763.56
1997	774.95
1998	795.44
1999	819.75
2000	839.5
2001	859.39
2002	853.15
2003	861.02
2004	852.09
2005	867.33
2006	884.25
2007	886.38
2008	891.7
2009	897.02
2010	917.75
2011	946.48
2012	975.91
2013	1000.44
2014	1020.55
2015	1038.3
2016	1058.3