Year	%
1990	32.6047603084143
1991	32.8029131540879
1992	32.9797720910059
1993	33.1445593819563
1994	33.2956791866704
1995	33.441265060241
1996	33.5813741154987
1997	33.7200211304807
1998	33.9137433501502
1999	34.1367077496983
2000	34.3505048776314
2001	34.5534407027818
2002	34.7287198493226
2003	34.8817798500482
2004	35.0198277040886
2005	35.1513651521467
2006	35.2960203028003
2007	35.4433242474379
2008	35.5770655904049
2009	35.7092857924095
2010	35.8308620943488
2011	35.9392724031761
2012	36.0281332421608
2013	36.0969303501835
2014	36.1350600957148
2015	36.1430735298026
2016	36.1500043055197
2017	36.1586281533931
2018	36.1711888845196
2019	36.1882394433935
2020	36.2081708390993
2021	36.2316376758958
2022	36.2569050264027