Year	Number of
1990	122.16
1991	125.93
1992	129.35
1993	132.13
1994	136.74
1995	141.3
1996	145.32
1997	148.5
1998	151.84
1999	155.6
2000	159.55
2001	161.81
2002	164.07
2003	166.44
2004	168.9
2005	171.35
2006	173.08
2007	174.69
2008	176.39
2009	178.49
2010	181.62
2011	184.73
2012	188.05
2013	191.71
2014	195.37
2015	199.25
2016	203.69