Year	Number of
1990	529.55
1991	542.3
1992	556.4
1993	572.14
1994	590.37
1995	611.96
1996	615.42
1997	620.91
1998	627.56
1999	635
2000	643.51
2001	648.97
2002	655.75
2003	663.73
2004	672.43
2005	683.51
2006	701.51
2007	720.25
2008	724.61
2009	753.52
2010	781.91
2011	811.66
2012	845.78
2013	880.98
2014	917.02
2015	954.67
2016	993.25