Year	%
1997	11.828240252897793
1998	12.784909614880805
1999	12.515151515151517
2000	14.800360252176528
2001	15.426997245179063
2002	16.657824933687
2003	16.674733785091966
2004	17.38329238329239
2005	19.305943358595933
2006	19.772545889864325
2007	20.22630834512023
2008	21.444201312910288
2009	22.38086050549874
2010	22.642244738893215
2011	25.246212121212128
2012	25.02227766886473
2013	25.91505524861879
2014	25.746907706945773
2015	28.149710068529256
2016	28.98916967509025
2017	28.70592262923658
2018	28.771570134973526
2019	29.274563820018376
2020	30.128447298828885
2021	30.47478836952523
2022	30.523627075351218
2023	30.518059102517334