Year	Number of
1990	254.94
1991	260.47
1992	266.66
1993	273.32
1994	280.54
1995	288.57
1996	290.24
1997	292.62
1998	295.46
1999	298.86
2000	303.08
2001	303.56
2002	304.87
2003	306.78
2004	309.32
2005	312.79
2006	318.01
2007	323.53
2008	329.99
2009	337.05
2010	345.05
2011	351.89
2012	359.71
2013	368.05
2014	377.06
2015	386.75
2016	396.99