Year	% of revenue
1991	5.447470817120611
1992	13.068093445733686
1993	7.879970724566955
1994	4.9187789821057795
1995	11.274317330001775
1996	9.233781587113937
1997	10.22941490307665
1998	9.521086108290127
1999	9.239661604750145
2000	12.017955993859609
2001	10.784598309570564
2002	10.855591101852541
2003	12.604176912232386
2004	11.77289485326648
2005	10.887703973634148
2006	12.596087851750152
2007	11.92962442962443
2008	11.413505757062342
2009	15.717856342543913
2010	13.392040461287372
2011	13.452486492815682
2012	13.723381339241753
2013	12.857058823529414
2014	11.690787835182789
2015	11.61096473581061
2016	9.720699001961103
2017	10.497122227476684
2018	10.090406510966544
2019	10.353152453526185
2020	10.65026431112071
2021	9.843923328947708
2022	10.757197158996252