Year	Number of
1990	207.57
1991	215.08
1992	209.42
1993	221.45
1994	223.51
1995	226.06
1996	216.08
1997	205.88
1998	206.56
1999	205
2000	204.62
2001	215.12
2002	212.13
2003	224.31
2004	223.29
2005	233.87
2006	238.06
2007	239.39
2008	241.76
2009	223.21
2010	221.03
2011	226.89
2012	229.62
2013	231.93
2014	226.63
2015	229.31
2016	229.5