Year	Number of
1990	467.62
1991	480.43
1992	506.31
1993	508.36
1994	533.81
1995	538.79
1996	577.08
1997	633.4
1998	659.31
1999	687.7
2000	723.06
2001	730.71
2002	746.82
2003	763.65
2004	776.11
2005	789.4
2006	810.2
2007	815.97
2008	815.68
2009	823.55
2010	837.65
2011	831.44
2012	818.27
2013	816.6
2014	828.85
2015	839.71
2016	845.57