Year	Number of
1990	394.74
1991	413.34
1992	432.86
1993	456.98
1994	472.37
1995	490.84
1996	510.95
1997	533.84
1998	558.36
1999	583.25
2000	606.52
2001	633.97
2002	655.73
2003	686.84
2004	720.46
2005	756.6
2006	786.78
2007	817.74
2008	850.25
2009	886.47
2010	926.36
2011	961.62
2012	999.33
2013	1037.71
2014	1078
2015	1118.66
2016	1157.52