Year	Number of
1990	419.02
1991	432.28
1992	445.55
1993	456.32
1994	470.53
1995	489.23
1996	503.51
1997	520.23
1998	538.77
1999	554.76
2000	567.5
2001	575.41
2002	582.42
2003	596.68
2004	612.19
2005	629.34
2006	634.05
2007	639.46
2008	644.6
2009	650.07
2010	655.74
2011	657.02
2012	658.84
2013	659.93
2014	661.92
2015	664.88
2016	665.74