Year	Number of
1990	144.3
1991	151.22
1992	159.07
1993	161.06
1994	167.99
1995	178.08
1996	185.6
1997	194.51
1998	196.74
1999	202.29
2000	210.01
2001	222.93
2002	233.33
2003	244.22
2004	254.95
2005	268.45
2006	281.17
2007	298.15
2008	313.2
2009	329.94
2010	347.36
2011	356.22
2012	365.38
2013	369.06
2014	373.06
2015	379.12
2016	387.47