Year	% of tax revenue
1972	13.556338028169016
1973	14.14790996784566
1974	9.415204678362574
1975	8.361204013377927
1976	9.251897361763643
1977	8.54853072128228
1978	7.2481572481572485
1979	4.879926108374384
1980	4.526166902404526
1981	4.520536392004723
1982	4.364548494983278
1983	4.015282583621684
1984	3.4820314039813414
1985	3.417600360340071
1986	6.4029880610951775
1987	4.987517926382323
1988	5.560998367156519
1989	5.9487217932378735
1990	6.640645871402771
1991	5.4555220215867815
1992	5.960013393288524
1993	6.100033795201081
1994	6.7144591357984185
1995	4.453298440095859
1996	3.7026777469990764
1997	2.9836118747493923
1998	1.6055510570109874
1999	2.3279221358253674
2001	4.735009249048602
2002	4.800909649947208
2003	4.3642370837397255
2004	4.39572861215219
2008	3.4558623715464227
2009	2.9206093669848787
2010	2.7674002878445805
2011	2.8912520569326925
2012	2.8983047735992606
2013	2.935208992769027
2014	2.7683142050536995
2015	2.4751383842337398
2016	2.4633897796412527
2017	2.5689751833238152
2018	2.5587568139627725
2019	2.386337647012192
2020	2.483817342479429
2021	2.4901270890182277
2022	2.2140015772768007