Year	%
1990	56.1052738957462
1991	56.6739606126915
1992	57.152682255846
1993	57.4824770575909
1994	57.8039320583122
1995	57.9380656416967
1996	58.186643557385
1997	58.3840232545621
1998	58.9027595269382
1999	59.5893064703603
2000	59.7857224704939
2001	59.8333896206237
2002	59.9248337669847
2003	59.9065367940994
2004	59.96850209986
2005	59.9757502273416
2006	59.8785166240409
2007	59.7201333943634
2008	59.595041858654
2009	59.4695726383509
2010	59.3402251925989
2011	59.3366257341164
2012	59.3835057158411
2013	59.3920552677029
2014	59.4360552494096
2015	59.5009174311927
2016	59.5595444603666
2017	59.6119793671568
2018	59.8219167382645
2019	60.161046001754
2020	60.4668125455872
2021	60.7216409918445
2022	60.9995800083998