Year	% of revenue
1990	0.5125652478071355
1991	0.4638361982039693
1992	0.481658692185008
1993	0.587141139335638
1994	0.6078025275793567
1995	0.5682248655201152
1996	0.8000831255195345
1997	1.0441118367536664
1998	1.557379298987182
1999	1.7571648507816202
2000	1.672913133292358
2001	1.1126918632060712
2002	0.9850261050644574
2003	1.0685534945252906
2004	1.0760919489949914
2005	1.1908602085339324
2006	1.2764160919177412
2007	1.4750913423885825
2008	0.9892480636754695
2009	1.538798675792416
2010	1.3330328454109002
2011	1.3293793036654782
2012	1.1004031124027374
2013	1.3131768561791712
2014	1.256839361869818
2015	1.04144017794536
2016	1.0658361485498977
2017	1.2470585588500316
2018	1.3047890603129606
2019	1.5264783714880679
2020	2.36050470833928
2021	2.3649677014223767
2022	1.8590979082167298