Year	Number of
1990	190.43
1991	196.54
1992	206.68
1993	213.65
1994	219.7
1995	227.07
1996	236.22
1997	243.24
1998	249.26
1999	252.97
2000	259.34
2001	260.24
2002	262.76
2003	267.39
2004	279.73
2005	287.22
2006	299.52
2007	306.84
2008	317.97
2009	329.66
2010	325.35
2011	326.03
2012	320.56
2013	308.28
2014	302.04
2015	300.24
2016	299.51