Year	Number of
1990	531.37
1991	520.02
1992	513.52
1993	495.02
1994	484.3
1995	475.98
1996	483.95
1997	490.57
1998	486.11
1999	494.16
2000	510.23
2001	518.81
2002	528.81
2003	533.62
2004	543.69
2005	552.59
2006	564.53
2007	574.43
2008	582.41
2009	592.06
2010	608.13
2011	618.49
2012	628.4
2013	645.43
2014	664.32
2015	685.79
2016	708.12