Year	% of revenue
1992	19.302088193654406
1993	14.115035321332961
1994	15.155260370822422
1995	16.644292190169026
1996	16.31561234002096
1997	15.73720859824402
1998	16.605951815286062
1999	22.440957083077254
2000	23.929410275520937
2001	21.490678086175702
2002	23.059246996556645
2003	27.03486155856542
2004	28.83193430845632
2005	19.269274108659253
2006	15.208671671904202
2007	28.976305756195487
2008	20.930836670833987
2009	24.264659712871183
2010	27.306412611757896
2011	27.253949163785805
2012	27.184172822761983
2013	26.16568506072352
2014	25.573006196701243
2015	21.242790190616024
2016	20.016243582261257
2017	20.68281056395193
2018	24.78865431148366
2019	21.25876977096592
2020	21.130950031704224
2021	21.462860703119777
2022	17.793318022326496