Year	Number of
1990	510.46
1991	538.44
1992	495.15
1993	511.45
1994	542.91
1995	549.56
1996	515.14
1997	434.57
1998	413.44
1999	415.63
2000	416.5
2001	413.87
2002	409.92
2003	422.02
2004	412.95
2005	441.31
2006	444.12
2007	429.03
2008	418.44
2009	407.38
2010	422.99
2011	366.24
2012	370.57
2013	357.84
2014	373.98
2015	373.07
2016	366.01