Year	% of revenue
1994	4.464319768107098
1995	2.2645652521906166
1996	2.1403258384837747
1997	1.9148393317886214
1998	1.5202178261306976
1999	1.2209836205607874
2000	1.0874394408999382
2001	1.1136826787571166
2002	0.9744070632257104
2003	1.0887316276537833
2004	0.329062097202214
2007	0.05249738498016657
2008	0.01141042342179581
2009	0.002765574499843996
2010	-0.004047282706613782
2011	-0.015040246739554442
2012	0.0007116523841566193
2013	-0.00017629957764497847
2014	-0.0021055154330041946
2015	-0.004538338227311419
2016	-0.07618054776624594
2017	-0.01093373612311214
2018	-0.005121300315809841
2019	0.0009919102174622992
2020	-0.008073747307644298
2021	-0.008227176246707544