Year	Number of
1990	424.1
1991	434.88
1992	446.61
1993	459.53
1994	473.66
1995	489.01
1996	495.31
1997	502.03
1998	509.58
1999	517.64
2000	526.21
2001	534.93
2002	544.13
2003	555.75
2004	567.76
2005	580.3
2006	590.36
2007	600.7
2008	611.76
2009	624.79
2010	640.18
2011	662.58
2012	687.8
2013	713.26
2014	738.46
2015	763.06
2016	789.38