Year	%
1982	12.325478090371
1983	12.325478090371
1984	12.325478090371
1985	13.4015118919113
1986	13.4993331465968
1987	13.3036906372258
1988	12.325478090371
1989	12.325478090371
1990	12.325478090371
1991	12.3019964706182
1992	12.0231759977324
1993	11.8323783953494
1994	11.0280532690074
1995	11.0753458564035
1996	9.99198375522363
1997	11.2359789946248
1998	11.7324774335856
1999	11.6211732253369
2000	11.5991975555663
2001	10.1867211949273
2002	11.3092285846433
2003	12.0482151558632
2004	10.184842378691
2005	10.0650792583996
2006	9.85230165386714
2007	9.75594317205468
2008	9.52898492988282
2009	10.9930534805853
2010	10.5750130912526
2011	10.6859790060702
2012	9.72590000699412
2013	9.27020682532407
2014	9.18598040160867
2015	8.96258333333333
2016	8.635
2017	8.3125
2018	7.835705
2019	7.57102791666667
2020	6.83319808333333
2021	6.5453035
2022	6.438381
2023	6.9300195