Year	% of revenue
1995	5.124162396531337
1996	12.172442941673712
1997	12.783536127384707
1998	18.10600706713781
1999	18.59832441957523
2000	19.35483870967742
2001	10.88351422049432
2002	13.105586177939376
2003	13.305432722678459
2004	6.353455583812965
2005	4.432388544434603
2006	2.8153626355155894
2007	2.0106519136286694
2008	2.1315371008951383
2009	3.35493709492947
2010	3.6458427946011738
2011	4.348427982526302
2012	3.4543203349981217
2013	3.0424904024444386
2014	2.9318105636163385
2015	3.3685383060357275
2016	3.798616948116451
2017	4.012527572446076
2018	4.349802587825267
2019	4.526439027300318
2020	6.055389280665872
2021	5.185319485094149
2022	3.8975768505698976