Year	Number of
1990	602.03
1991	598.12
1992	597.34
1993	591.61
1994	594.16
1995	594.64
1996	596.86
1997	598.38
1998	590.08
1999	588.26
2000	587.09
2001	593.18
2002	605.39
2003	611.85
2004	618.43
2005	626.43
2006	649.28
2007	674.6
2008	718.86
2009	737.85
2010	759.67
2011	784.99
2012	804.21
2013	807.77
2014	821.08
2015	821.86
2016	830.64