Year	Number of
1990	298.77
1991	316.65
1992	336.15
1993	357.41
1994	380.45
1995	405.45
1996	422.13
1997	439.96
1998	458.98
1999	478.88
2000	499.63
2001	521.78
2002	544.97
2003	569.92
2004	595.8
2005	622.84
2006	654.45
2007	686.87
2008	721.51
2009	757.9
2010	796.4
2011	837.61
2012	881.59
2013	928.57
2014	977.6
2015	1028.54
2016	1081.29