Year	Number of
1990	187.39
1991	192.13
1992	199.01
1993	203.81
1994	210.52
1995	211.47
1996	215.3
1997	219.28
1998	224.81
1999	231.46
2000	239.14
2001	247.84
2002	254.28
2003	267.42
2004	275.38
2005	279.27
2006	281.79
2007	280.97
2008	295.03
2009	305.02
2010	315.32
2011	326.58
2012	339.41
2013	353.68
2014	369.1
2015	386.49
2016	396.6