Year	% (cumulative)
1970	6.77839994430542
1978	7.16846990585327
1988	8.87884044647217
2002	12.1654996871948
2006	15.1131887435913
2007	15.4189224243164
2008	15.9463195800781
2009	17.0067596435547
2010	18.2912502288818
2011	18.7915306091309
2012	19.382740020752
2013	20.2519092559814
2014	21.2539100646973
2015	21.5413551330566
2016	21.8629894256592
2017	22.7589645385742
2018	23.2314701080322
2019	24.0258178710938
2020	24.5680503845215
2021	24.51877784729
2022	24.7140331268311