Year % of total taxes 1972 23.045507584597434 1973 23.937246963562753 1974 28.42242503259452 1975 29.89566613162119 1976 23.346055979643765 1977 20.81427264409881 1978 25.21454842664487 1979 25.710818307905686 1980 32.89492494639028 1981 25.64726076383922 2003 22.50667264318168 2004 25.158573204225203 2005 26.38350132546541 2006 29.444979942675182 2007 30.952607849069818 2008 31.09791822193663 2009 32.02975794768535 2010 30.670707838127687 2011 33.662509809493976 2012 32.465518241118325 2013 34.11954771942259 2014 31.1019142710382 2015 31.29380731418852 2020 29.570600001456132