Year	% (cumulative)
1971	1.86713004112244
1992	6.44245004653931
2006	9.35124969482422
2007	6.16616010665894
2008	10.7341804504395
2009	10.8172702789307
2010	6.78207015991211
2011	10.2079801559448
2012	11.2188596725464
2013	10.1643600463867
2016	8.49256992340088
2017	7.95080995559692
2019	9.57398986816406
2020	9.88720989227295