Year	% (cumulative)
1976	30.8999996185303
1981	35.2925300598145
1990	36.0941963195801
1991	36.4585952758789
1992	37.5337905883789
1993	39.0508880615234
1994	41.5660171508789
1995	42.5823402404785
1996	43.3501319885254
1997	45.6528549194336
1998	46.3734664916992
1999	47.1515922546387
2000	47.5545463562012
2001	49.1189765930176
2002	50.0226783752441
2003	51.1924285888672
2004	51.8652610778809
2005	53.2947158813477
2006	55.9819297790527
2007	55.2305679321289
2008	55.7530822753906
2009	56.2153816223145
2010	57.3237533569336
2011	59.640308380127
2012	58.9546966552734
2013	59.4432792663574
2014	59.8476753234863
2015	60.8823738098145
2016	60.4142990112305
2017	62.2785263061523
2018	63.1919555664062
2019	64.5579147338867
2020	65.3256530761719
2021	62.2103805541992
2022	67.2747039794922
2023	68.0393142700195