Year	Number of
1990	301.71
1991	306.99
1992	314.31
1993	325.19
1994	337.07
1995	345.63
1996	345.24
1997	351.12
1998	375.6
1999	376.87
2000	383
2001	396.46
2002	412.82
2003	437.28
2004	461.2
2005	484.18
2006	510.16
2007	534.67
2008	564.73
2009	593.71
2010	622.25
2011	649.77
2012	678.36
2013	709.31
2014	741.65
2015	775.05
2016	803.67