Year	Number of
1990	186.18
1991	183.95
1992	190.79
1993	198.78
1994	200.29
1995	204.1
1996	210.77
1997	216.48
1998	226.08
1999	233.25
2000	236.95
2001	241.93
2002	249.71
2003	261.66
2004	267.91
2005	271.21
2006	275.13
2007	285.37
2008	298.65
2009	309.74
2010	324.67
2011	333.68
2012	341.39
2013	349.69
2014	360.39
2015	373.37
2016	384.89