Year	% of revenue
1993	2.9881154499151115
1994	3.5743298131600367
1995	5.490446440786174
1996	4.76187020484847
1997	5.765730824679768
1998	6.286710861816987
1999	7.504347068270759
2000	8.384006761674453
2001	8.782783730980997
2002	5.898765185690454
2003	4.988167072626619
2004	4.620243836144357
2005	3.8916474413338316
2006	3.415937712178347
2007	3.1140255149270284
2008	2.73544801860734
2009	4.105640504755243
2010	5.398310710221757
2011	5.628961419613774
2012	5.352352722782022
2013	5.796226221956222
2014	5.3885969155140145
2015	4.68371217461819
2016	4.567914466334196
2017	4.0422419154868034
2018	3.602787649407837
2019	3.2941030151271233
2020	3.1527278314899014
2021	2.858086461073754
2022	2.8268295359482187