Year	Number of
1990	454.4
1991	455.97
1992	465.06
1993	473.95
1994	484.27
1995	494.89
1996	512.05
1997	532.48
1998	554.81
1999	577.1
2000	600.55
2001	618.89
2002	637.92
2003	659.32
2004	680.79
2005	705.42
2006	726.6
2007	746.91
2008	766.75
2009	785.59
2010	800.85
2011	804.03
2012	810.46
2013	815.13
2014	811.05
2015	806.48
2016	801.97