Year	% of tax revenue
1979	56.94444444444444
1980	68.90243902439023
1981	69.09871244635193
1982	56.19047619047619
1983	58.64077669902913
1984	68.53146853146853
1985	57.87139689578714
1986	61.398467432950184
1987	68
1988	68.34245893479343
1990	56.62482566248257
1991	60.29492080830148
1992	60.99023090586145
1993	60.71723000824403
1994	63.42281879194631
1995	64.21299921691464
1996	63.188893563315105
1997	63.97407707441268
1998	63.86396366456187
1999	64.30983321395682
2000	64.371670941014
2001	63.22377221479075
2002	63.39653751030503
2003	64.40450855206117
2004	68.95944633317144
2005	72.3067100069654
2006	71.04286196422545
2007	71.8219682627104
2008	72.73375311868837
2009	67.67203513909223
2010	70.13749104431784
2011	52.86141344797832
2014	17.975725007105638
2015	18.808260680820776
2016	18.372738714605763
2017	18.255622937140263
2018	18.792316036659656
2019	19.420356049839576
2020	19.709868704951703
2021	18.060310770505524