Year	% of revenue
1992	3.050847457627119
1993	3.2309746328437914
1994	1.5563415866599293
1995	2.588798788583718
1996	7.398889918954864
1997	4.451685928138073
1998	6.9506850427720535
1999	7.6494220163793205
2000	6.586812633121865
2001	6.570189376046722
2002	5.788300131313915
2003	3.713646454187927
2004	7.497117541650936
2005	6.9270459344928605
2006	8.645437583202181
2007	7.684773433509509
2008	6.09186857078037
2009	12.759313120803453
2010	8.936321356651748
2011	14.895144473541984
2012	14.64766767698364
2013	13.895313492805084
2014	16.975334824986003
2015	19.925628794273226
2016	23.647672310040925
2017	28.921455799238338
2018	25.607173034345205
2019	25.53338788710634
2020	23.970903728257426
2021	20.247014934702026
2022	22.67279793242258