Year	% of revenue
1985	0.26624068157614483
1986	0.08383635144198524
1987	0.42153929834103887
1988	0.3712871287128713
1989	0.3135430363103065
1993	0.4328675577156744
1994	0.8522270461488987
1995	0.6437167646235656
1996	0.8777319406653208
1997	0.9754562617998742
1998	0.9268113276940052
1999	0.9983471074380166
2000	1.5030131159163418
2017	1.2010755143207466
2018	1.5060497893044524
2019	4.399032482581908
2020	1.6969777512190425