Year	Number of
1990	119.21
1991	127.66
1992	138.73
1993	152.61
1994	167.4
1995	181.25
1996	190.94
1997	198.96
1998	205.85
1999	212.85
2000	221.65
2001	231.37
2002	241.2
2003	253.11
2004	265.09
2005	276.05
2006	286.18
2007	295.1
2008	304.72
2009	313.81
2010	323.44
2011	332.06
2012	342.63
2013	356.25
2014	369.54
2015	383
2016	398.37