Year	Number of
1990	180.94
1991	191.07
1992	202.04
1993	214.25
1994	227.26
1995	241.27
1996	257.5
1997	275.25
1998	295.68
1999	317.76
2000	341.89
2001	359.53
2002	378.73
2003	399.2
2004	421.33
2005	445.13
2006	472.62
2007	502.4
2008	534.17
2009	570.54
2010	612.84
2011	650.08
2012	691.96
2013	737.15
2014	786.56
2015	840.22
2016	899.51