Year	% of revenue
1990	29.10927456382002
1991	22.82984859408796
1992	26.514330312621947
1993	32.83472864586383
1994	32.194543297746144
1995	36.251123021159266
1996	35.31455189020619
1997	33.5554985901051
1998	32.85343171498428
1999	35.14159447014103
2001	49.401462786599346
2002	34.0486606455897
2003	41.956050385462554
2004	47.44818668954285
2005	45.173609484091656
2006	19.68050415857546
2007	19.780786587524783
2008	46.85633834627836
2009	53.418710339483546
2010	47.830897768860346
2011	38.75778441086724
2012	19.986898301140595
2013	31.51971439078856
2014	26.0682768972952
2015	25.1687840045085
2016	27.639090086884305
2017	26.019408261179212
2018	26.00474064009947
2019	31.00015385404079
2020	30.617964361391653
2021	31.248915613273287
2022	23.52295102701016