Year	%
1990	15.916955017301
1991	16.1007249141549
1992	16.2745854222908
1993	16.4813343923749
1994	16.6389351081531
1995	16.821602478973
1996	17.0009551098376
1997	17.1384457025219
1998	17.2167216721672
1999	17.2796263864565
2000	17.3645320197044
2001	17.4582798459564
2002	17.526455026455
2003	17.5485599464166
2004	17.5846051758461
2005	17.5449871465296
2006	17.451690821256
2007	17.4930362116992
2008	17.469262295082
2009	17.4242424242424
2010	17.4714661984197
2011	17.4745417515275
2012	17.6515440335494
2013	17.7865612648221
2014	17.8922399186716
2015	17.9380785189914
2016	17.9510426110607
2017	17.9318246920653
2018	17.9027438196142
2019	17.9069767441861
2020	17.9207920792079
2021	17.9505468378507
2022	18.2748856458288