Year	% (cumulative)
1971	1.4726699590683
1981	2.90000009536743
2001	9.09796047210693
2005	9.87814998626709
2006	10.5259799957275
2007	11.2174396514893
2008	11.9547300338745
2009	12.1757202148438
2010	12.472149848938
2011	12.5752000808716
2012	13.2975397109985
2013	14.157036781311
2014	14.4294004440308
2015	15.1314601898193
2016	15.6583518981934
2017	16.8161640167236
2018	17.3764801025391
2019	17.6936016082764
2020	17.7516708374023
2021	17.845983505249
2022	18.1641616821289