Year	Number of
1990	292.9
1991	296.38
1992	298.17
1993	298.01
1994	296.59
1995	299.71
1996	297.85
1997	301.34
1998	297.26
1999	285.67
2000	277.34
2001	275.75
2002	279.92
2003	283.27
2004	286.3
2005	291.2
2006	295.97
2007	299.47
2008	302.66
2009	307.27
2010	312.51
2011	317.96
2012	329.79
2013	339.85
2014	349.09
2015	357.23
2016	366.9