Year	Number of
1990	668.2
1991	673.01
1992	681.5
1993	690.8
1994	702.95
1995	715.88
1996	729.1
1997	717.91
1998	707.49
1999	694.35
2000	686.17
2001	664.88
2002	655.58
2003	656.38
2004	665.08
2005	672.5
2006	675.28
2007	675.84
2008	685.56
2009	700.91
2010	726.24
2011	749.09
2012	770.75
2013	791.42
2014	813.99
2015	836.77
2016	860.95