Year	Number
1995	10.83849
1996	10.62805
1997	10.48007
1998	10.75714
1999	11.3229
2000	11.77755
2001	11.94741
2002	11.96396
2003	12.23843
2004	11.91976
2005	11.59204
2006	11.28063
2007	11.16539
2008	11.22591
2009	10.9407
2010	10.79151
2011	9.98661
2012	9.79576
2013	9.83483
2014	9.76519
2015	9.62437
2016	9.56865
2017	9.58736
2018	9.60642