Year	Number of
1990	437.21
1991	436.27
1992	435.53
1993	434.28
1994	432.84
1995	431.71
1996	440.23
1997	448.79
1998	457.96
1999	468.73
2000	481.86
2001	510.74
2002	543.4
2003	580
2004	620.6
2005	665.79
2006	701.96
2007	740.01
2008	783.41
2009	830.89
2010	883.77
2011	921.47
2012	962.68
2013	1008.89
2014	1056.65
2015	1105.77
2016	1158.55