Year	%
1990	12.8342245989305
1991	12.3456790123457
1992	12.2977346278317
1993	12.4352331606218
1994	12.2105263157895
1995	12.1951219512195
1996	12.1915820029028
1997	12.1951219512195
1998	12.111801242236
1999	12.0353982300885
2000	12.0214395099541
2001	11.9433198380567
2002	11.9304556354916
2003	11.9506966773848
2004	11.9884448724121
2005	12.035472972973
2006	12.0754716981132
2007	12.0764844012077
2008	12.0226730310262
2009	11.9776417354272
2010	11.8632240055827
2011	11.4832535885167
2012	10.9921082299887
2013	10.5118986474919
2014	10.1164254247955
2015	9.77432590855803
2016	9.50538822879248
2017	9.28065108952481
2018	9.06921241050119
2019	8.90717657025293
2020	8.74515788238056
2021	8.62641768816588
2022	8.54604745305296