Year	% of revenue
1990	0.10705359503885492
1991	0.1518278168472309
1992	0.09554171243689291
1993	0.044582438758766614
1994	0.13505247253520705
1995	0.15428565773457062
1996	0.1817521090201168
1997	0.06315789473684211
1998	0.137245931638455
1999	0.12470180004337454
2003	2.268352219166974E-05
2011	1.3668738846165347
2012	0.7228844187020972
2013	0.7777886546527725
2014	0.9666211921252169
2015	1.1807301391358775
2016	1.0979453415426004
2017	1.3641227594290224
2018	1.6354456965952224
2019	1.944807530623421
2020	2.237089036714868
2021	2.219772990857063