Year	Number of
1990	458.28
1991	464.05
1992	470.29
1993	473.2
1994	478.39
1995	483.67
1996	488.06
1997	492.67
1998	503.12
1999	517.25
2000	530.36
2001	543.33
2002	555.67
2003	578.73
2004	578.05
2005	583.74
2006	591.9
2007	605.11
2008	615.69
2009	623.08
2010	626.03
2011	638.07
2012	649.55
2013	658.62
2014	667.8
2015	674.85
2016	683.36