Year	Number of
1990	200.89
1991	207.08
1992	213.49
1993	216.78
1994	222.83
1995	228.59
1996	234.1
1997	245.73
1998	251.42
1999	261.1
2000	269.84
2001	279.1
2002	288.28
2003	297.03
2004	305.14
2005	313.42
2006	319.9
2007	326.18
2008	335.8
2009	345.28
2010	355.41
2011	364.34
2012	373.67
2013	383.29
2014	392.58
2015	402.65
2016	412.87