Year	Number of
1990	331.91
1991	343.73
1992	356.09
1993	368.83
1994	382.05
1995	397.01
1996	407.65
1997	418.38
1998	429.98
1999	441.28
2000	454.42
2001	470.6
2002	485.88
2003	501.71
2004	518.38
2005	536.03
2006	555.34
2007	575.07
2008	596.19
2009	618.39
2010	642.08
2011	652.28
2012	661.07
2013	671.13
2014	681.27
2015	691.48
2016	702.18