Year	% of revenue
1990	12.409650074252042
1991	8.556072051133036
1992	67.85714285714286
1993	27.527970168373468
1994	20.502730562140684
1995	0.9905660377358491
1996	6.431667516573176
1997	0.19819641264493112
1998	4.5929063697060455
1999	11.40215716486903
2002	1.5560140586078421
2003	1.5442890622208225
2004	7.279686497736545
2005	8.767195294071836
2006	9.299049280752456
2007	2.2573166341849156
2008	1.9359870472569256
2009	2.01339157779018
2010	1.2766552249718088
2012	2.015293948838565
2013	1.2360678811820835
2014	1.2621859394764574
2015	0.9617140584578644
2016	0.7727299544650312
2017	1.3425147263871937
2018	0.9772242067836082
2019	0.7767616611884339
2020	0.4477353401562187
2021	0.5570111686397613
2022	0.514036894677786