Year	% of tax revenue
1972	2.2289833983729084
1973	1.9957277998169056
1974	1.8860704132954296
1975	2.2762243327850586
1976	3.064011521080598
1977	2.224243426492476
1978	2.5126183546402387
1979	2.4383283657809627
1980	2.142259896779402
1981	2.027329192546584
1982	2.224496929145653
1983	2.318778918257725
1984	2.793691036298481
1985	2.7032425594247287
1986	2.8833551769331587
1987	2.848059594800504
1988	2.9413354960800215
1989	2.704257767548907
1990	2.6936512514822293
1991	2.5222645309500584
1992	2.6850998463901687
1993	2.678381934717093
1994	2.61703007130309
1995	2.317265055070805
1996	2.0452392102196617
1997	1.7771075430970757
1998	1.6475304940801663
1999	1.5616795677433561
2000	1.5041778539894557
2001	1.6445990787663018
2002	1.8487023756075878
2003	1.9945437983343246
2004	1.9981694310432057
2005	1.818974589682658
2006	1.7078492976424169
2007	1.7619798012113739
2008	1.9267036804045492
2009	2.017082409714785
2010	2.219563508864286
2011	2.1431442401058085
2012	2.11105791581502
2013	2.0086563415418026
2014	1.9467626475796938
2015	1.8633848518048655
2016	1.8388364271859918
2017	1.7070199995213093
2018	2.5978296099920786
2019	3.6513298315726694
2020	3.1518746633490857
2021	3.341863756421165
2022	3.2641098533932467