Year	% (cumulative)
1970	5.55979
1980	6.42121
1991	12.28359
2003	12.00774
2006	13.82981
2008	15.18693
2009	15.28482
2010	15.8321
2011	16.1243
2012	15.68907
2013	16.30318
2014	15.67415
2015	15.59705
2016	17.07514