Year	%
1990	15.2645603349829
1991	15.2716091561326
1992	15.282181357007
1993	15.3194066000605
1994	15.3481481481481
1995	15.3976790263232
1996	15.4384077461001
1997	15.4911515773275
1998	15.5311355311355
1999	15.5823107200741
2000	15.6215861918287
2001	15.6673511293634
2002	15.7337949605693
2003	15.7885272433016
2004	15.8610271903323
2005	15.9615682628235
2006	16.0439247005134
2007	16.1134343962363
2008	16.150178784267
2009	16.1769489320178
2010	16.1812617237634
2011	16.1864330232138
2012	16.1887295765255
2013	16.1970734744707
2014	16.2162162162162
2015	16.2360581674432
2016	16.2700041034058
2017	16.3037670317927
2018	16.3448321005433
2019	16.3845068616134
2020	16.4142678347935
2021	16.4401019541206
2022	16.4461027225558