Year	% (cumulative)
1980	5.32739019393921
1990	9.16987991333008
2000	9.02966976165771
2004	12.5401096343994
2005	12.1078195571899
2006	14.9123296737671
2007	14.4471797943115
2008	14.4625301361084
2009	15.4787902832031
2010	14.4238395690918
2012	16.3126907348633
2013	14.7768001556396
2014	14.4319295883179
2015	16.2725505828857
2016	15.1532297134399
2017	15.8232803344727
2018	16.4495906829834
2020	18.7714595794678