Year	% (cumulative)
1970	18.6632709503174
1975	22.2000007629395
1979	26.8999996185303
1980	28.1006393432617
1981	27.994270324707
1994	44.5495109558105
1995	28.4138031005859
1996	29.2770595550537
1997	29.953104019165
1998	30.7137680053711
1999	31.6391868591309
2000	32.3990325927734
2001	33.3034553527832
2002	34.1997299194336
2003	34.9652481079102
2004	37.2069702148438
2005	36.0050392150879
2006	37.5999717712402
2007	37.7020378112793
2008	38.4406700134277
2009	39.1529693603516
2010	39.8992195129395
2011	40.5313186645508
2012	41.1223106384277
2013	42.164680480957
2014	42.8737182617188
2015	43.4328994750977
2016	44.6219596862793
2017	45.9092216491699
2018	46.4446411132812
2019	47.8764915466309
2020	49.7664489746094
2021	49.8460350036621
2022	50.2360305786133
2023	51.0278244018555