Year	Number of
1990	521.26
1991	530.44
1992	498.05
1993	494.37
1994	547.76
1995	545.89
1996	498.58
1997	413.49
1998	386.92
1999	385.82
2000	383.03
2001	362.31
2002	359.23
2003	360.16
2004	363.15
2005	383.86
2006	373.85
2007	375.57
2008	367.4
2009	365.19
2010	375.5
2011	334.25
2012	339.23
2013	319.34
2014	328.59
2015	337.48
2016	338.1