Year	%
1990	15.0724637681159
1991	14.7286821705426
1992	14.2666666666667
1993	13.8967136150235
1994	13.4550371872887
1995	13.0761523046092
1996	12.6797880393641
1997	12.3054331864905
1998	11.9839584807738
1999	11.6784037558685
2000	11.3875438303557
2001	11.1305872042068
2002	10.9262413205817
2003	10.7757065544197
2004	10.655090765588
2005	10.5579399141631
2006	10.4563716905326
2007	10.3745541022592
2008	10.3045829775121
2009	10.2452710652548
2010	10.1662952168695
2011	10.0599760095962
2012	9.96279761904762
2013	9.87406587323554
2014	9.79052529809861
2015	9.72180315008147
2016	9.69949250156811
2017	9.68577907353418
2018	9.67775093796577
2019	9.68090859924283
2020	9.67925063866023
2021	9.68864468864469
2022	9.70561998215879