Year	%
1990	25.925658619943412
1991	26.143169916124904
1992	26.834461042056613
1993	27.0194793558692
1994	27.164425500203503
1995	27.26243946690906
1996	27.347432217093644
1997	27.284982953328672
1998	27.366820395951017
1999	27.272846904826785
2000	27.650573930331568
2001	28.35412645986954
2002	28.240330749385738
2003	28.235536180918984
2004	28.097306656428373
2005	27.967838537703162
2006	27.731455080179142
2007	27.651446831497406
2008	27.505052128784424
2009	27.44366253827461
2010	26.895709893134725
2011	26.834760813051354
2012	26.748255029985053
2013	26.68569671655557
2014	26.662456396165307
2015	26.579806111458918
2016	26.610425527408744
2017	26.583698244136652
2018	26.57283117727617
2019	26.599432675235686
2020	26.604362833581476
2021	26.62523870440317