Year	%
2000	31.376247170877818
2001	30.69024624170772
2002	30.201068486214165
2003	29.912419166156788
2004	29.480293792005845
2005	29.20549042306465
2006	28.99809433324353
2007	28.666374094969505
2008	28.570232149593878
2009	28.268605927582485
2010	27.816423969593117
2011	27.35320934282033
2012	26.839179329798032
2013	26.476759963342374
2014	26.056566933382683
2015	25.821495879757496
2016	25.527854672833808
2017	25.224517906035235
2018	24.882864204038828
2019	24.552694831839183