Year	%
1990	32.3529411764706
1991	32.0710059171598
1992	31.633714880333
1993	31.3473877176902
1994	31.1328443357783
1995	31.1812179016875
1996	31.3804713804714
1997	31.5952824332713
1998	31.8965517241379
1999	32.1790090570059
2000	32.4270884824518
2001	32.6146788990826
2002	32.8644501278772
2003	33.0424434748116
2004	33.2348596750369
2005	33.4021327829377
2006	33.5254562920269
2007	33.6306868867083
2008	33.7273227047829
2009	33.8324873096447
2010	33.9653558052434
2011	34.1621621621622
2012	34.3561973525872
2013	34.5271404588696
2014	34.6889120611748
2015	34.8243331164606
2016	34.9579831932773
2017	35.0950460829493
2018	35.2260348583878
2019	35.3290322580645
2020	35.4419516979282
2021	35.5399883245768
2022	35.6181150550796