Year	Number of
1990	303.27
1991	297.93
1992	301.82
1993	302.21
1994	308.96
1995	305.64
1996	292.63
1997	282.82
1998	280.13
1999	262.84
2000	243.9
2001	230.19
2002	225.03
2003	220.78
2004	217.4
2005	219.57
2006	217.99
2007	214.68
2008	210.09
2009	198.79
2010	195.74
2011	195.97
2012	194.94
2013	193.81
2014	195.22
2015	198.08
2016	199.63