Year	Number of
1990	426.33
1991	412.33
1992	412.74
1993	413.33
1994	419.94
1995	422.33
1996	414.35
1997	399.19
1998	384.83
1999	379.24
2000	388.22
2001	390.27
2002	400.02
2003	400.7
2004	410.58
2005	419.13
2006	421.33
2007	435.64
2008	443.34
2009	459.4
2010	470.74
2011	472.83
2012	479.16
2013	485.4
2014	492.99
2015	501.78
2016	515.06