Year	% of tax revenue
1990	36.966706745719144
1991	36.188384577842854
1992	32.76436723563276
1993	32.537849627918916
1994	31.346578366445915
1995	33.94942622118411
1996	33.066113798663906
1997	33.169874545380246
1998	31.841791389327074
1999	31.67870036101083
2000	31.192688223938227
2001	30.94043483854368
2002	29.7805802039104
2003	31.380541903730958
2004	31.043115438108483
2005	27.517521550768137
2006	25.419601008201802
2007	22.39482500945496
2008	24.091836806591242
2009	22.01163079777841
2010	20.99344106459
2011	19.39028537422104
2012	19.32051265096376
2013	20.958621221765718
2014	20.52298279494795
2015	19.814709931636486
2016	18.477858075122416
2017	17.767875045735078
2018	18.44066251244244
2019	17.923262958663937
2020	19.16977379693428
2021	22.09891061848868