Year	% of revenue
1992	25.26273241713824
1993	12.295555922682967
1994	23.396909929714834
1995	27.423701653434335
1996	26.33231111003791
1997	22.188037281693965
1998	34.27093022608153
1999	29.01962133574504
2000	26.054707597324644
2001	26.89488371068022
2002	31.24809323879072
2003	27.03486155856542
2006	16.8090358735183
2007	30.6494564186658
2008	16.603452019484514
2009	26.058388624137198
2010	23.13921327956857
2011	24.560740704706237
2012	27.304491707319343
2013	25.421333012234975
2014	30.55066021535951
2015	27.932146251820477
2016	25.319730456851765
2017	25.978571056703753
2018	24.78865431148366
2019	32.370668244666206
2020	36.34684789698672
2021	26.269335916308357