Year	Number of
1990	292.46
1991	309.19
1992	327.12
1993	347.74
1994	369.94
1995	393.85
1996	412.1
1997	431.19
1998	451.94
1999	473.61
2000	496.36
2001	525.16
2002	555.77
2003	588.47
2004	623.08
2005	659.72
2006	705.23
2007	753.96
2008	806.61
2009	863.25
2010	924.27
2011	962.27
2012	1002.63
2013	1046.47
2014	1092.55
2015	1140.85
2016	1191.04