Year	Number of
1990	258.49
1991	269.41
1992	281.78
1993	295.68
1994	309.92
1995	324.47
1996	336.7
1997	348.52
1998	359.99
1999	371.88
2000	384.82
2001	399.86
2002	415.83
2003	433.49
2004	452.2
2005	472.26
2006	492.85
2007	514.54
2008	538.44
2009	563.65
2010	590.4
2011	618.84
2012	648.61
2013	679.42
2014	712.66
2015	748.85
2016	791.83