Year	Number of
1990	197.48
1991	208.85
1992	217.43
1993	226.82
1994	233.84
1995	239.38
1996	243.14
1997	245.95
1998	246.03
1999	243.84
2000	245.14
2001	249.7
2002	254.57
2003	258.55
2004	261.04
2005	261.52
2006	262.9
2007	266.22
2008	272.09
2009	282.42
2010	291.57
2011	299.08
2012	305.08
2013	311.09
2014	317.99
2015	323.19
2016	327.09