Year	Number of
1990	192.68
1991	190.45
1992	188.37
1993	184.6
1994	185.52
1995	187.87
1996	189.01
1997	198.26
1998	198.51
1999	204.49
2000	209.12
2001	220.39
2002	238.8
2003	250.13
2004	263.43
2005	274.31
2006	283.38
2007	295.83
2008	302.16
2009	310.53
2010	319.4
2011	325.39
2012	331.02
2013	333.75
2014	338.1
2015	346.45
2016	356.86