Year	Number of
1990	264.52
1991	271.04
1992	276.58
1993	287.77
1994	299.19
1995	311.78
1996	327.35
1997	344.51
1998	362.6
1999	378.77
2000	391.32
2001	405.29
2002	427.82
2003	446.67
2004	460.78
2005	478.79
2006	509.18
2007	552.41
2008	608.71
2009	656.3
2010	709.47
2011	690.59
2012	675.72
2013	659.96
2014	650.01
2015	645.56
2016	645.57