Year	Number of
1990	201.86
1991	202.45
1992	206.61
1993	211.7
1994	216.63
1995	222.41
1996	232.47
1997	241.89
1998	257.62
1999	274.65
2000	290.5
2001	299.02
2002	310.25
2003	329.1
2004	353.1
2005	381.23
2006	410.49
2007	437.68
2008	463.3
2009	487.47
2010	508.65
2011	529.58
2012	561.97
2013	596.42
2014	632.61
2015	666.85
2016	699.37