Year	Number of
1990	313.87
1991	335.94
1992	347.64
1993	385.37
1994	404.11
1995	405.84
1996	399.03
1997	391.27
1998	405.07
1999	405.96
2000	412.3
2001	440.87
2002	446.78
2003	455.45
2004	462.95
2005	492.03
2006	501.27
2007	520.92
2008	504.08
2009	478.65
2010	487.44
2011	482.25
2012	483.43
2013	489.08
2014	475.03
2015	472.89
2016	472.23