Year	% of revenue
1992	27.1018593371059
1993	23.374772839914094
1994	22.054680001238506
1996	21.734720981334362
1997	27.72539438361536
1998	31.799016358744993
1999	39.64915557477931
2000	36.021991214068045
2001	40.035315150530145
2002	33.8761970834248
2003	35.409176311150134
2006	33.377293400943564
2007	20.432482110790534
2008	25.271185361838207
2009	30.157853850020977
2010	28.542982931624262
2011	36.237808654522446
2012	35.67866779397498
2013	36.202854195993766
2014	32.586347316696745
2015	31.474029418679628
2016	34.272878914928974
2017	30.91337517999357
2018	31.640169102358374
2019	27.077902322943043
2020	27.31510302526922
2021	30.93581992179365