Year	Number of
1990	184.38
1991	188.84
1992	193.73
1993	199.01
1994	204.77
1995	211.08
1996	218.2
1997	226.09
1998	234.76
1999	244.2
2000	254.46
2001	262.38
2002	271.14
2003	280.59
2004	290.6
2005	301.22
2006	311.9
2007	323.02
2008	335.06
2009	348.1
2010	362.49
2011	372.91
2012	384.64
2013	397.31
2014	410.89
2015	425.31
2016	439.44