Year	Number of
1990	489.74
1991	518.11
1992	547.71
1993	577.18
1994	605.39
1995	635.83
1996	633.53
1997	632.8
1998	633.88
1999	633.98
2000	633.24
2001	665.25
2002	700.89
2003	733.87
2004	765.95
2005	797.93
2006	806.75
2007	813.7
2008	819.69
2009	826.07
2010	832.32
2011	832.92
2012	834.96
2013	837.24
2014	842.34
2015	847.68
2016	853.4