Year	%
1997	16.885917619150316
1998	17.949298325033958
1999	18.23885525591634
2000	19.41747572815534
2001	18.957345971563978
2002	20.12927054478301
2003	20.724543080939945
2004	21.670478057279755
2005	22.03407880724174
2006	22.775649212430817
2007	23.65762892078682
2008	24.31772326643306
2009	24.737456242707125
2010	24.854204220125126
2011	25.319420783645658
2012	25.939329430548163
2013	27.47800275628114
2014	28.12838863587074
2015	28.56524561783164
2016	28.562155144433632
2017	29.571566627295173
2018	30.42777300085984
2019	31.972496776966057
2020	32.935355491018605
2021	33.51931330472103
2022	33.571664283357165
2023	33.52266399376322