Year	Number of
1990	357.6
1991	367.84
1992	379.3
1993	391.47
1994	404.41
1995	418.26
1996	424.37
1997	430.55
1998	436.91
1999	443.1
2000	449.26
2001	459.49
2002	469.66
2003	481.26
2004	492.91
2005	505
2006	517.21
2007	529.92
2008	544.19
2009	560.02
2010	577.67
2011	599.05
2012	622.9
2013	648.14
2014	675.08
2015	703.69
2016	733.92