Year	Number of
1990	258.89
1991	273.87
1992	289.68
1993	306.51
1994	324.47
1995	343.79
1996	361.1
1997	379.75
1998	399.99
1999	421.48
2000	444.29
2001	456.85
2002	470.12
2003	484.47
2004	499.65
2005	515.78
2006	522.4
2007	529.8
2008	538.5
2009	547.85
2010	557.95
2011	572.71
2012	588.75
2013	605.61
2014	624.21
2015	644.66
2016	665.05