Year	% (cumulative)
1970	2.21711993217468
1981	5.45983982086182
1986	5.80000019073486
1991	7.25481986999512
2004	20.5345306396484
2005	22.2011203765869
2006	22.6354808807373
2007	23.2614498138428
2008	23.6192798614502
2009	24.3477001190186
2010	25.1720294952393
2011	25.9938793182373
2012	26.5921001434326
2013	28.2329807281494
2014	28.8613204956055
2015	29.5635604858398
2016	30.2423305511475
2017	31.0358963012695
2018	31.4250602722168
2019	33.2239074707031
2020	33.9941711425781
2021	35.7229347229004
2022	36.311939239502