Year % of total taxes 1990 23.325567192200683 1991 25.011942761600764 1992 29.079311613140526 1993 27.5369413056407 1994 24.466765497836807 1995 19.50307194235325 1996 20.70037264899975 1997 21.681168210128533 1998 23.61212933934078 1999 25.30890582048758 2000 25.724946659161308 2001 23.60760599918433 2002 21.932098199527168 2003 23.463447386089864 2004 23.992048401868193 2005 27.26889747359641 2006 26.054947976072196 2007 30.438390708239808 2008 33.11238654519924 2009 35.49272531881835 2010 36.418773811546025 2011 35.49548368254952 2012 33.111379290084464 2013 32.8249661086199 2014 32.2373474193885 2015 29.570538044730966 2016 28.302664748997092 2017 27.931629522778167