Year	Number of
1990	197.16
1991	200.84
1992	204.72
1993	209.89
1994	215.59
1995	221.95
1996	226.38
1997	230.8
1998	235.38
1999	240.38
2000	246
2001	252.12
2002	258.39
2003	265.66
2004	272.5
2005	279.13
2006	286.5
2007	293.69
2008	301.52
2009	309.46
2010	318.06
2011	331.6
2012	345.74
2013	361.21
2014	378.26
2015	397.49
2016	410.39