Year	Number of
1990	765.59
1991	785.23
1992	803.47
1993	831.99
1994	861.71
1995	887.21
1996	914.62
1997	940.04
1998	959.23
1999	985.56
2000	1011.27
2001	1043.62
2002	1071.42
2003	1102
2004	1128.72
2005	1153.82
2006	1185.9
2007	1210.38
2008	1238.83
2009	1264.19
2010	1294.13
2011	1327.56
2012	1357.05
2013	1379.32
2014	1407.19
2015	1445.04
2016	1495.55