Year	Number of
1990	208.66
1991	226.35
1992	219.99
1993	238.97
1994	258.93
1995	248.69
1996	234.69
1997	234.48
1998	249.4
1999	242.68
2000	252.99
2001	260.5
2002	251.43
2003	247.45
2004	237.52
2005	241.04
2006	239.21
2007	236.38
2008	230.96
2009	226.1
2010	210.68
2011	219.82
2012	220.25
2013	221.01
2014	219.08
2015	216.21
2016	215.05