Year	%
1982	10.184890795448
1983	10.4529142374335
1984	11.2123139897257
1985	10.7656082530832
1986	10.9889611214044
1987	11.2569845633899
1988	11.2569845633899
1989	11.2569845633899
1990	11.2569845633899
1991	11.2163014829248
1992	11.5231698453901
1993	11.9238245391238
1994	11.6104913178287
1995	11.5007436413857
1996	11.4303325301194
1997	11.1730597100209
1998	11.2725600466202
1999	11.3956730721677
2000	11.6808005322677
2001	11.1397494990693
2002	10.9728957217648
2003	11.5007049422952
2004	8.94144093203256
2005	9.91817590459821
2006	9.50240122157026
2007	9.16801247233374
2008	9.06404638816547
2009	10.0192940627616
2010	9.45501398850831
2011	8.84037965492994
2012	9.04298186920945
2013	9.07396001934442
2014	8.93663314196025
2015	8.66866666666666
2016	8.2775
2017	8.075
2018	7.81221991666667
2019	7.53996066666667
2020	6.89907858333333
2021	6.29791625
2022	6.53699175
2023	5.935577