Year	% (cumulative)
1974	13.5278100967407
1981	20.3808403015137
2001	31.3077392578125
2011	41.123908996582
2012	41.6014785766602
2013	38.559440612793
2014	39.1312484741211
2015	45.2260894775391
2016	46.0259284973145
2017	46.8000717163086
2018	47.5890808105469
2019	48.3503913879395
2021	52.0992813110352