Year	% (cumulative)
1975	6.76938009262085
1985	8.94169998168945
1996	11.3056297302246
2003	11.8940200805664
2006	11.349889755249
2008	11.3174695968628
2009	11.5732402801514
2010	11.1542997360229
2011	12.9671802520752
2012	12.9635496139526
2013	13.9404602050781
2014	14.4155797958374
2015	14.5785903930664
2016	14.7911701202393
2017	15.6020402908325
2018	15.7165203094482
2019	16.073169708252