Year	%
1990	39.6030245746692
1991	39.2463470904896
1992	37.841726618705
1993	35.7685950413223
1994	33.3289142251094
1995	30.9875749785775
1996	29.0087719298246
1997	27.5437172581716
1998	26.5836457208209
1999	26.0604364857303
2000	25.9234961647154
2001	26.0940561724363
2002	26.4897456209841
2003	27.0724735160585
2004	27.7836347417079
2005	28.566927893514
2006	29.3896497487244
2007	30.203548085901
2008	30.9494451294698
2009	31.5793171280034
2010	32.0812182741117
2011	32.4466872863422
2012	32.791922739245
2013	33.3131728559332
2014	33.9345649826343
2015	34.4201067115979
2016	34.6138282662063
2017	34.5909020338457
2018	34.5259215454366
2019	34.388723615243
2020	34.2356724212639
2021	34.0710695705846
2022	33.8363083772099