Year	Number of
1990	113.01
1991	118.21
1992	123.92
1993	130.09
1994	136.67
1995	143.82
1996	148.93
1997	154.49
1998	160.43
1999	166.62
2000	173.27
2001	175.87
2002	178.72
2003	181.73
2004	184.87
2005	188.42
2006	190.45
2007	192.54
2008	195.26
2009	198.25
2010	201.75
2011	204.78
2012	208.51
2013	212.6
2014	217
2015	221.69
2016	226.69