Year	Number of
1990	210.06
1991	215.29
1992	221.4
1993	228.16
1994	235.39
1995	243.04
1996	249.34
1997	255.79
1998	262.33
1999	269.01
2000	276.02
2001	280.9
2002	286.06
2003	291.47
2004	297.14
2005	303.34
2006	308.3
2007	313.75
2008	320
2009	326.76
2010	334.1
2011	341.45
2012	349.38
2013	357.76
2014	366.89
2015	376.87
2016	387.13