Year	Number of
1990	435.48
1991	444.95
1992	426.39
1993	448.36
1994	449.23
1995	443.42
1996	413.86
1997	386.17
1998	386.67
1999	374.56
2000	363.16
2001	375.3
2002	359.17
2003	364.87
2004	349.79
2005	366.12
2006	365.17
2007	367.25
2008	366.38
2009	319.34
2010	316.96
2011	315.33
2012	309.71
2013	304.23
2014	286.08
2015	287.78
2016	285.81