Year	Number of
1990	433.95
1991	454.25
1992	471.41
1993	486.54
1994	516.77
1995	532.29
1996	554.39
1997	580.96
1998	610.97
1999	646.1
2000	686.32
2001	717.35
2002	748.18
2003	780.97
2004	808.81
2005	836.85
2006	857.56
2007	877.34
2008	884.45
2009	907.02
2010	930.62
2011	933.83
2012	941.63
2013	948.26
2014	965.18
2015	989.68
2016	1010.91