Year	% of revenue
1994	34.4425798085358
1995	38.8994543467821
1996	39.02135568483734
1997	33.78177708788523
1998	33.03847764026019
1999	35.3454737651355
2000	36.143272041709835
2001	35.29997030451647
2002	35.086052652840024
2003	33.550617871497074
2004	31.535168195718654
2005	29.780614744044247
2006	28.89564922182497
2007	29.95865543658191
2008	31.039787103583645
2009	33.331854648086214
2010	29.571349863903123
2011	29.650388801973122
2012	29.38399066796601
2013	29.09878888066811
2014	28.832801160774903
2015	28.62774185002624
2016	28.17458317113242
2017	28.843640654917202
2018	30.250196491269122
2019	32.685274542958496
2020	32.76746279835019
2021	32.17461249560705
2022	32.59310860375423