Year	Number of
1990	537.71
1991	536.02
1992	536.63
1993	543.65
1994	558.67
1995	590.77
1996	576.18
1997	566.59
1998	554.31
1999	546.39
2000	546.19
2001	570.14
2002	592.03
2003	601.63
2004	606.98
2005	615.42
2006	621.07
2007	627.1
2008	628.75
2009	631.9
2010	638.29
2011	653.47
2012	672.69
2013	697.32
2014	725.38
2015	758
2016	793.26