Year	%
1981	5.997329876222369
1982	6.284361767613037
1983	8.083637004261666
1984	9.77937964186377
1985	15.130809419338913
1986	22.794411527891015
1987	31.671850648961563
1988	32.97560036570924
1989	38.03884431830465
1990	43.536472633251435
1991	46.123176904498195
1992	49.13531601432738
1993	50.10672508384219
1994	50.31544789586512
1995	53.02692936356166
1996	54.58246226851696
1997	58.26136198617939
1998	59.5288168016496
1999	60.50008165856407
2000	63.913030957502066
2001	66.21431811383627
2002	69.5294310359186
2003	70.30129921650993
2004	69.98798650771897
2005	70.44989993219609
2006	72.08082737267308
2007	71.46724271194594
2008	73.11426758787482
2009	76.15293390515515
2010	77.00355694196722
2011	68.24353904131786
2012	68.84046026965228
2013	68.74002096540826
2014	67.16227883797562
2015	67.44390656320519
2016	69.23464545060881
2017	72.0209930479855
2018	74.13278355039448
2019	73.95625285467176
2020	76.10244625296129
2021	76.16327210440532
2022	76.97243637077997