Year	Number of
1990	200.19
1991	203.71
1992	207.7
1993	211.92
1994	216.63
1995	221.91
1996	222.94
1997	223.96
1998	225.37
1999	227.38
2000	230.14
2001	237.03
2002	245.05
2003	254.54
2004	264.74
2005	275.63
2006	284.79
2007	294.17
2008	303.66
2009	313.52
2010	323.84
2011	332.63
2012	342.03
2013	351.8
2014	362.37
2015	373.72
2016	384.6