Year	%
1990	35.875486381323
1991	35.8448506464556
1992	35.6832971800434
1993	35.4537597234226
1994	35.2964851086665
1995	35.2098023349902
1996	35.1365546218487
1997	35.0454633391372
1998	34.9202055720855
1999	34.7478319440936
2000	34.5261657825984
2001	34.2867924528302
2002	34.0046196044464
2003	33.6986681465039
2004	33.371237458194
2005	33.0220275666624
2006	32.6634729048715
2007	32.2989957303506
2008	31.9337016574586
2009	31.6177297783778
2010	31.3537640846987
2011	31.142781736606
2012	31.0380109479716
2013	30.9824300915615
2014	30.9513560051657
2015	30.9572113611214
2016	30.9771033013844
2017	30.9961996669371
2018	30.9447722058341
2019	30.8545361595029
2020	30.7282616907154
2021	30.5611948955917
2022	30.42463510642