Year	% of revenue
1993	0.015363933166890725
1994	0.46086412022542267
2004	2.977686655892516
2005	2.425594959410472
2006	2.127329157171074
2007	1.9484475916432265
2008	1.7893969771591804
2009	3.4509259378661032
2010	5.398310710221757
2011	5.688636538018875
2012	6.373104004393368
2013	5.796226221956222
2014	5.3885969155140145
2015	5.12991637698323
2016	4.670808731970268
2017	4.0422419154868034
2018	3.227308390893074
2019	2.9658713016911613
2020	2.239414796275087
2021	1.4481420239098244
2022	1.035169947965337