Year	% of revenue
1998	7.312190372667164
1999	10.116348210403004
2000	11.52339484981871
2001	9.015165483543838
2002	5.083175451915252
2003	4.5618215367140635
2004	4.451110022457538
2005	5.726139854389975
2006	6.627283307190204
2007	6.018682975066965
2008	4.6937489824665715
2009	1.3751510210496332
2010	2.1616944190597884
2011	1.7005834240571698
2012	1.9003962886749854
2013	1.7191625849749481
2014	1.8965976017628987
2015	1.8997054094034866
2016	-1.3508568502267173
2017	2.072837275530204
2018	2.274465362832833
2019	2.613350184258621
2020	2.0894669183904404
2021	2.6880746327533385
2022	3.8455510338423426