Year	Number of
1990	491.63
1991	504.09
1992	526.82
1993	543.24
1994	557.38
1995	566.98
1996	578.48
1997	589.61
1998	573.95
1999	560.95
2000	554.75
2001	520.33
2002	515.52
2003	504.34
2004	503.35
2005	512.89
2006	510.18
2007	526.39
2008	530.95
2009	547.31
2010	569.88
2011	585.07
2012	602.09
2013	631.14
2014	685.37
2015	751.34
2016	794.31