Year	% of revenue
1990	17.24378456479498
1991	15.423111919927207
1992	16.159650380688994
1993	10.295020518951755
1994	14.060616025430232
1995	11.373232521602514
1996	11.752970955424944
1997	9.559487751740264
1998	10.285220397579948
1999	9.038644479064702
2000	9.07505771673824
2001	9.35976754679747
2002	12.108652544199195
2003	11.258056869738194
2004	8.545376954843347
2005	9.04299363138236
2006	10.433391220360662
2007	7.908861110191778
2008	9.950827602351795
2009	7.750374472023109
2010	8.417357309977405
2011	9.699782347828585
2012	7.369724918287609
2013	8.566248696290774
2014	6.529466687284136
2015	6.534414739707718
2016	3.7152849073617857
2017	3.548230021515284
2018	5.196117494606634
2019	5.140453062267225
2020	5.181130295102018
2021	6.236891935727408
2022	12.42106899540238