Year	%
1990	28.1541330018645
1991	28.1821341675356
1992	28.2041003321498
1993	28.2186774655538
1994	28.2300884955752
1995	28.2491637431672
1996	28.2765777538627
1997	28.3055433669738
1998	28.3439824028491
1999	28.3818650939919
2000	28.4157234529683
2001	28.4754409431673
2002	28.6132135210928
2003	28.7184750733138
2004	28.8081835585907
2005	28.8942133563648
2006	28.9714798401349
2007	29.0511840288839
2008	29.1529124320952
2009	29.244009879561
2010	29.3434267725978
2011	29.47008462901
2012	29.5912422933152
2013	29.739001103488
2014	29.8816778507576
2015	29.9716806703021
2016	30.0379524206239
2017	30.1024140453548
2018	30.1945630804691
2019	30.2273183572401
2020	30.287558296311
2021	30.3152806767
2022	30.3390721513997