Year	Number of
1990	452.44
1991	452.35
1992	451.91
1993	452.12
1994	452.86
1995	456.49
1996	460.57
1997	463.08
1998	468.23
1999	486.45
2000	514.35
2001	549.86
2002	591.09
2003	632.59
2004	668.72
2005	702.18
2006	741.62
2007	778.14
2008	815.72
2009	855.58
2010	897.49
2011	935.85
2012	976.02
2013	1019.51
2014	1063.48
2015	1113.82
2016	1165.62