Year	% (cumulative)
1980	54.6592788696289
1990	66.714111328125
1997	74.0834884643555
2000	81.2799987792969
2001	78.0100021362305
2002	79.120002746582
2003	79.7200012207031
2004	80.379997253418
2005	80.9100036621094
2006	81.6600036621094
2007	81.9300003051758
2008	83.0400009155273
2009	82.9400024414062
2010	82.6293563842773
2011	83.1699981689453
2013	84.4899978637695
2014	84.9400024414062
2015	85.5500030517578
2016	86.1800003051758
2017	86.3899993896484
2018	86.4300003051758
2019	87.5
2021	88.6600036621094
2022	88.5
2023	88.6054763793945