Year	Number of
1990	309.49
1991	315.96
1992	331.72
1993	347.9
1994	379.6
1995	432.36
1996	422.63
1997	424.89
1998	424.1
1999	417.33
2000	421.36
2001	415.23
2002	410.53
2003	401.1
2004	399.45
2005	397.05
2006	397.41
2007	395.09
2008	392.49
2009	389.95
2010	396.51
2011	400.94
2012	408.05
2013	413.6
2014	419.99
2015	426.95
2016	435.53