Year % of total taxes 1972 17.77777777777778 1973 28.26086956521739 1974 32.20338983050847 1975 26.582278481012654 1976 18.81188118811881 1977 16.783216783216783 1978 13.524590163934427 1979 20.2020202020202 1980 28.055260361317746 1981 17.221418234442837 1982 16.496220542463316 1983 13.031835763165725 1984 11.750659796405682 1985 10.55245941361764 1986 23.855392156862745 1987 21.188738942338738 1988 23.056300268096514 1989 17.543614794138172 1990 6.323025227284357 1991 8.47173993475966 1992 13.900223601562429 1993 16.68135844579564 1994 19.74990244615771 1995 19.037897154523414 1996 23.969920751150305 1997 24.0979358332885 1998 25.154036934297743 1999 27.375202747397132 2000 26.970205365142384 2001 27.401054344178384 2002 26.650763041526748 2003 30.63999970807927 2004 30.27716770058696 2005 31.632148158620204 2006 40.504947203827406 2007 43.57346155140325 2008 41.46976928143336 2009 38.671314824604885 2010 40.026120543469155 2011 44.516309051064056 2012 44.33699662724357 2013 40.877011812032976 2014 42.13038897215943 2015 38.53036643180109 2016 41.673898547552085 2017 40.55187025832994 2018 39.80022625603886 2019 39.76770636472509 2020 41.01070470320888 2021 39.23696040378146