Year	% of revenue
1998	1.145071842702294
1999	3.4049881600393643
2000	0.643444737056444
2001	9.971509971509972
2002	0.07810127131513864
2003	0.017295053614666205
2005	2.441147665856578
2006	0.023930601256356567
2007	0.022815423226100844
2008	0.8504206988337731
2009	0.38020777551676127
2010	0.41420983382876075
2011	0.33325406329537366
2012	0.4249989532196476
2013	0.4259244720106775
2014	0.47232825853223565
2015	0.3975397835089468
2016	0.41283940595921487
2017	0.384896066633618
2018	0.39312930930204426
2019	0.4417821040808686
2020	0.3317786219166226
2021	0.4474090946066867