Year	% of tax revenue
1990	17.928710844628405
1991	31.925792461922022
1992	17.287678508257898
1993	41.186791121407076
1994	38.37328748454049
1995	42.02385653067005
1996	12.860771431939726
1997	13.6248485516026
1998	17.244936234058514
1999	17.122542262207066
2007	11.492493587717261
2008	13.293268285403176
2009	11.321332559502245
2010	10.011878255421948
2011	10.13161613800175
2012	10.314760129292376
2013	8.23497127621591
2014	7.059906019436768
2015	7.261099731983825
2016	6.505737913813155
2017	7.002206927144498
2018	6.887986837058295
2019	7.062722421365438
2020	6.405400186345039
2021	7.102384241843743