Year	Number of
1990	389.11
1991	396.78
1992	404.65
1993	412.86
1994	421.33
1995	430.43
1996	427.83
1997	425.82
1998	424.43
1999	423.31
2000	422.65
2001	445.88
2002	471.11
2003	498.51
2004	527.84
2005	559.54
2006	575.28
2007	591.92
2008	610.8
2009	631.16
2010	653.35
2011	664.26
2012	676.46
2013	688.86
2014	702.25
2015	716.61
2016	732.06