Year	Number of
1990	182.11
1991	188.17
1992	192.08
1993	197.18
1994	200.05
1995	206.06
1996	209.73
1997	216.63
1998	217.48
1999	219.63
2000	224.59
2001	231.14
2002	239.34
2003	248.43
2004	254.71
2005	260.42
2006	269.61
2007	282.81
2008	297.96
2009	306.58
2010	322.83
2011	330.79
2012	340.24
2013	351.75
2014	361.76
2015	365.3
2016	370.23