Year	Number of
1990	105.83
1991	110.85
1992	116.2
1993	121.81
1994	127.77
1995	134.07
1996	137.88
1997	141.83
1998	146.09
1999	150.62
2000	155.44
2001	159.9
2002	164.56
2003	169.26
2004	174.39
2005	180.17
2006	186.56
2007	193.16
2008	200.26
2009	207.64
2010	215.35
2011	220.1
2012	225.2
2013	230.42
2014	236.12
2015	241.66
2016	247.5