Year	%
1990	12.9173989455184
1991	12.6768867924528
1992	12.4050632911392
1993	12.1173469387755
1994	11.8567103935419
1995	11.6206681884208
1996	11.3739922888188
1997	11.1881785283474
1998	11.0114730317816
1999	10.8799813018581
2000	10.7660020986359
2001	10.655346751884
2002	10.5640577175339
2003	10.437167285046
2004	10.3262898529082
2005	10.1920543576232
2006	10.0728703166312
2007	9.96327734633677
2008	9.85160525870338
2009	9.71152313658822
2010	9.57954488370925
2011	9.45121951219512
2012	9.31854199683043
2013	9.17838957452317
2014	9.05380333951762
2015	8.92976984722277
2016	8.81105641802348
2017	8.67098275987488
2018	8.52829924348557
2019	8.34741466711727
2020	8.15606313106558
2021	7.98987021209243
2022	7.77746939278996