Year	Number of
1990	198.89
1991	204.17
1992	210.51
1993	216.91
1994	226.12
1995	234.61
1996	241.51
1997	254.49
1998	265.67
1999	275.42
2000	287.78
2001	292.14
2002	298.54
2003	303.79
2004	311.08
2005	320.66
2006	324.85
2007	330.77
2008	336.31
2009	342.63
2010	353.39
2011	363.55
2012	373.36
2013	384.11
2014	393.91
2015	404.94
2016	418.13