Year	Number of
1990	197.84
1991	205.66
1992	216.7
1993	226.47
1994	237.36
1995	249.82
1996	253.85
1997	262.44
1998	268.14
1999	266.52
2000	267.11
2001	270.55
2002	270.62
2003	272.1
2004	276.69
2005	282.82
2006	291.59
2007	297.19
2008	303.98
2009	310.53
2010	317.33
2011	328.02
2012	339.4
2013	352.95
2014	366.65
2015	381.1
2016	394.42