Year	Number of
1990	445.42
1991	455.55
1992	462.68
1993	457.57
1994	462.85
1995	470.43
1996	497.39
1997	528.98
1998	569.51
1999	586.44
2000	622.74
2001	626.36
2002	642.05
2003	659.21
2004	683.65
2005	710.67
2006	739.02
2007	762.04
2008	800.75
2009	823.29
2010	849.26
2011	883.84
2012	899.46
2013	916.99
2014	929.76
2015	926.77
2016	933.73