Year	Number of
1990	402.27
1991	416.52
1992	431.88
1993	448.5
1994	465.93
1995	484.28
1996	496.16
1997	508.39
1998	521.25
1999	534.43
2000	548.17
2001	560.76
2002	573.71
2003	587.77
2004	602.33
2005	617.67
2006	633.19
2007	649.47
2008	667.88
2009	687.13
2010	707.42
2011	728.56
2012	751
2013	774.97
2014	800.38
2015	827.31
2016	855.98