Year	Number of
1990	465.98
1991	481.51
1992	498.99
1993	517.7
1994	536.58
1995	555.47
1996	564.85
1997	573.37
1998	581.65
1999	590.78
2000	601.5
2001	608.32
2002	616.59
2003	626.66
2004	637.73
2005	649.93
2006	669.36
2007	690.08
2008	713.21
2009	737.68
2010	763.71
2011	793.85
2012	825.9
2013	859.59
2014	895.47
2015	933.76
2016	974.21