Year	%
1990	59.9921639689497
1991	60.456695954427
1992	60.5948671463373
1993	60.6261437684927
1994	60.6286067600989
1995	60.6064658681242
1996	60.5295677008824
1997	60.4244029352279
1998	60.3083019823154
1999	60.1906814031556
2000	60.075623044492
2001	59.9683469365202
2002	59.8953840148336
2003	59.7935392008543
2004	59.6789853521299
2005	59.5857378245593
2006	59.4664235166434
2007	59.3385530622209
2008	59.2254221863392
2009	59.1457032143575
2010	59.1054053229671
2011	59.1804674994117
2012	59.2631096758683
2013	59.3959924211977
2014	59.5430006513352
2015	59.6763425477256
2016	59.8054722297973
2017	59.9363727694589
2018	60.0744133647589
2019	60.2592271027872
2020	60.4788601207319
2021	60.7696341438124
2022	60.9951917369108