Year	Number of
1990	272.09
1991	272.92
1992	274.51
1993	285.13
1994	284.2
1995	287.01
1996	292.69
1997	295
1998	299.96
1999	297.64
2000	296.75
2001	295.4
2002	299.38
2003	305.75
2004	307.09
2005	308.31
2006	309.95
2007	311.53
2008	318.56
2009	328.78
2010	340.07
2011	347.79
2012	357.23
2013	367.21
2014	378.02
2015	389.67
2016	402.29