Year	% of revenue
1992	38.983050847457626
1993	31.935914552736982
1994	35.35792487788446
1995	33.18117476654999
1996	37.44875990869404
1997	41.11614932677604
1998	37.958576942968804
1999	37.915483814904825
2000	38.80325828886395
2001	36.448294265960776
2002	36.07239218323032
2003	34.43745627692289
2004	34.564783418185776
2005	33.58006880651088
2006	38.32403691925539
2007	34.19328021140635
2008	30.17449416646492
2009	28.835935923304895
2010	32.31075287851909
2011	28.936460404020252
2012	28.99073107542163
2013	31.119261197283997
2014	32.35053330229319
2015	28.042550335354765
2016	28.961807128655266
2017	26.020033377582923
2018	26.568604262433272
2019	26.94141694568792
2020	29.24129767545441
2021	30.581247307659424
2022	29.02892128663705