Year	Number of
1990	292.01
1991	308.96
1992	326.36
1993	344.56
1994	364.7
1995	387.32
1996	398.18
1997	409.89
1998	422.26
1999	435.58
2000	449.97
2001	461.91
2002	474.81
2003	489.55
2004	505.63
2005	523.27
2006	543.3
2007	564.93
2008	588.38
2009	613.79
2010	641.53
2011	664.86
2012	689.61
2013	713.92
2014	739.42
2015	766.3
2016	798.56