Year	Number of
1990	508.46
1991	522.04
1992	536.84
1993	552.07
1994	567.13
1995	582.05
1996	609.11
1997	636.42
1998	664.71
1999	694.55
2000	726.82
2001	737.64
2002	750.08
2003	762.96
2004	776.15
2005	790.09
2006	795.6
2007	801.73
2008	809.84
2009	819.59
2010	831.89
2011	834.51
2012	838.79
2013	843.87
2014	849.1
2015	854.11
2016	852.08