Year	Number of
1990	197.67
1991	200.75
1992	204.03
1993	207.75
1994	211.73
1995	216.61
1996	219.58
1997	224.41
1998	227.03
1999	230.43
2000	236.06
2001	237.83
2002	244.1
2003	249.96
2004	256.68
2005	262.89
2006	268.75
2007	273.3
2008	300.9
2009	280.52
2010	284.57
2011	284.47
2012	297.93
2013	310.79
2014	323.87
2015	337.32
2016	350.8