Year	% of tax revenue
1990	66.02095028067362
1995	55.73541167066347
1996	56.42633228840125
1997	38.14270724029381
1998	50.96089008766015
1999	41.08710330857529
2009	37.45088643986584
2012	21.426120985111275
2013	20.17243282952496
2014	19.361075587734053
2015	21.848723771525812
2016	22.12619509908451
2017	21.467112103705617
2018	20.518527337166102
2019	19.225399421213268
2020	21.287239602777568
2021	18.10906887983745