Year	%
1980	17.320570272859406
1981	20.040533714069912
1982	26.771031145993994
1983	29.41945204429094
1984	33.60268167350585
1985	38.67319129349262
1986	44.59339160706074
1987	53.51359538067848
1988	59.429638693581744
1989	60.427656893032214
1990	73.86204659953817
1991	75.89101862365973
1992	76.6347628235577
1993	77.67700136615046
1994	78.49925364398368
1995	78.2627148082578
1996	78.06312656079659
1997	80.27538023919442
1998	80.02961228015482
1999	81.29784340453749
2000	81.84929353624932
2001	81.3921020986122
2002	85.18035734688458
2003	84.7615792971272
2004	85.49243278102294
2005	85.42930217084029
2006	85.95580357996691
2007	85.17551992140488
2008	85.40166435345957
2009	86.35437959893788
2010	86.6633775934512
2011	84.73842592452255
2012	84.6539098130734
2013	84.77585040040069
2014	85.0592553999345
2015	85.13673913190837
2016	86.00244147248738
2017	89.11369603901237
2018	89.02764075448907
2019	88.99803214883727
2020	88.75950424530573
2021	89.02709729950988
2022	90.7880416969411