Year	% of tax revenue
1997	0.0017622387481055933
2000	0.0454260469727708
2001	0.34245899331159185
2002	0.8478385980309842
2003	0.7347019676834317
2004	0.7308167039307968
2010	17.45522122219454
2011	15.691045256118946
2012	11.084578745752076
2013	25.417814469545856
2014	26.884590177951516
2015	22.89296907846776
2016	17.35292889962441
2017	20.612979217216996
2018	21.92679425668159
2019	19.957360072972207
2020	12.841596076576417
2021	18.305383936451896