Year	% of tax revenue
1997	4.73513551615973
1998	5.342539426438255
1999	4.444814383219577
2000	4.739651718989306
2001	5.671552423181427
2002	5.120306575337798
2003	5.035936542794889
2004	4.483110900111912
2010	7.265396969124789
2011	16.22825309399786
2012	7.623249971917496
2013	5.154072518903196
2014	4.952924919746817
2015	4.702895031846957
2016	5.67588429771014
2017	5.299519051180191
2018	4.555622478101306
2019	4.529227140484098
2020	5.851913280046053
2021	5.473458580254697