Year	Number of
1990	456.46
1991	461.69
1992	460.07
1993	459.43
1994	463.51
1995	478.09
1996	491.78
1997	514.32
1998	538.77
1999	560.53
2000	586.41
2001	598.9
2002	615.51
2003	628.61
2004	639.31
2005	648.88
2006	659.27
2007	666.61
2008	682.65
2009	697.08
2010	702.22
2011	707.41
2012	715.78
2013	728.55
2014	745.26
2015	763.95
2016	779.38