Year	Number of
1990	450.89
1991	435.97
1992	419.01
1993	408.38
1994	386.29
1995	367.62
1996	359.49
1997	345.94
1998	333.31
1999	327.35
2000	319.56
2001	314.16
2002	308.25
2003	305.32
2004	297.16
2005	286.04
2006	279.91
2007	273.24
2008	270.06
2009	266.1
2010	262.68
2011	259.66
2012	255.78
2013	250.77
2014	242.85
2015	245.38
2016	241.82