Year	Number of
1990	213.16
1991	215.96
1992	218.39
1993	221.75
1994	225.25
1995	228.62
1996	231.12
1997	233.95
1998	236.43
1999	240.51
2000	244.25
2001	249.74
2002	255.16
2003	261.87
2004	268.72
2005	275.72
2006	282.5
2007	289.01
2008	296.73
2009	304.89
2010	312.65
2011	323.37
2012	335.36
2013	347.64
2014	360.5
2015	374.2
2016	388.27