Year	% of revenue
1994	50.84468755732702
1995	33.446982025731096
1996	21.032553537640826
1997	8.187571267814612
1998	8.9086179424656
1999	8.37235501625361
2008	2.2113965757716643
2009	2.7958289254949373
2010	1.4570868319171402
2011	1.8114061187711812
2012	2.570454153377951
2013	2.8448800241610623
2014	2.8847501539637705
2015	3.069819444519101
2016	3.3852438816325754
2017	3.6313007668736526
2018	3.359628067107416
2019	3.7052568849356335
2020	4.361273544488372
2021	3.8319176651629774