Year	% of revenue
1990	8.207906883403572
1991	10.576727124515998
1992	27.876520112254443
1993	27.7140169332079
1994	25.91498440833744
1995	24.943207632894136
1996	27.92766515969083
1997	26.661997363216877
1998	27.12333993303821
1999	29.564389622886928
2000	23.80594156180208
2001	21.63132137030995
2002	21.453227943363405
2003	23.149483964043945
2004	26.787391353605173
2005	17.772978374625602
2006	4.611867902558339
2007	16.407532867606005
2008	34.90566301861542
2009	6.424519473258831
2010	7.258288415973563
2011	6.624116663603038
2012	6.3752745098543535
2013	8.396691564175635
2014	7.509180420449568
2015	6.491285499935293
2016	5.684312728481724
2017	6.172281490586394
2018	6.262926273237913
2019	4.921911095742317
2020	5.068370132563447
2021	7.650837563123847
2022	6.0635617571797304