Year	Number of
1990	393.05
1991	382.36
1992	369.08
1993	343.04
1994	313.92
1995	286.85
1996	262.83
1997	255.79
1998	254.71
1999	253.9
2000	254.97
2001	254.85
2002	263.55
2003	280
2004	289.87
2005	270.28
2006	250.66
2007	239.53
2008	244.03
2009	249.02
2010	252.85
2011	254.02
2012	259.38
2013	252.64
2014	252.27
2015	243.97
2016	237.78