Year	Number of
1990	465.71
1991	500.87
1992	534.83
1993	574.15
1994	616.64
1995	653.64
1996	669.96
1997	696.61
1998	702.47
1999	708.44
2000	719.22
2001	726.29
2002	728.14
2003	732.7
2004	732.57
2005	745.38
2006	744.85
2007	751.06
2008	751.95
2009	756.36
2010	770.07
2011	774.89
2012	779.88
2013	793.33
2014	800.22
2015	829.19
2016	855.56