Year % of tax revenue 1990 24.65416522729968 1991 37.38648078150312 1992 40.986904224311346 1993 34.46701570680628 1994 31.254939843681388 1995 37.722290444353476 1996 37.23152340991234 2006 41.5258496136692 2007 45.374891989501265 2008 37.89007174548077 2009 39.56611580555331 2010 30.26941324271284 2011 33.90589896345739 2012 47.718228127509086 2013 41.08681551846619 2014 41.70761012638579 2015 43.869306000453136 2016 33.11422445608238 2017 44.790385072137354 2018 39.15542898416575 2019 36.8202243401945 2020 43.11313610589626 2021 30.61303403268245 2022 28.03320916208094