Year	% of revenue
1992	4.406779661016949
1993	17.303070761014684
1994	9.831564763348492
1995	5.878221939363348
1996	5.41126095441019
1997	7.674650373899151
1998	7.439103095744519
1999	6.676860340718855
2000	5.412668239317806
2001	6.134630603218227
2002	7.5223908902049015
2003	8.904132762855852
2004	6.956157023800916
2005	7.6540668811952495
2006	7.024729376011991
2007	16.90028583676943
2008	21.0241347134791
2009	16.448114380724803
2010	11.174463223768177
2011	17.56704096567753
2012	16.019393055223674
2013	12.109626445731847
2014	8.34062244997476
2015	14.114333931677608
2016	11.302578449401885
2017	10.176623880116711
2018	13.262694905306011
2019	10.88157694391207
2020	9.19528365058666
2021	10.070874921022737
2022	7.254812342090965