Year	Number of
1990	415.9
1991	422.94
1992	444.84
1993	470.51
1994	504.4
1995	529.51
1996	554.45
1997	561.55
1998	578.43
1999	605.73
2000	616.57
2001	652.19
2002	677.51
2003	722.85
2004	737.18
2005	753.62
2006	780.02
2007	800.57
2008	822.49
2009	843.71
2010	871.51
2011	888.94
2012	899.24
2013	901.53
2014	905.91
2015	897.91
2016	891.47