Year	Number of
1990	126.35
1991	127.94
1992	129.78
1993	131.8
1994	134
1995	136.52
1996	137.51
1997	138.76
1998	140.1
1999	141.5
2000	143.06
2001	144.06
2002	145.19
2003	146.52
2004	148.14
2005	150.21
2006	153.73
2007	157.64
2008	162.12
2009	166.82
2010	171.72
2011	176.56
2012	181.56
2013	186.68
2014	192.14
2015	198.05
2016	204.44