Year	% of revenue
1997	0.5422194146136029
1998	0.6350197793046013
1999	0.4550625711035267
2011	7.2755863554619165
2012	7.259738343449845
2013	8.112907758689099
2014	8.5329215507042
2015	6.652961935514451
2016	6.946118110848063
2017	6.803183740765559
2018	6.810373345427132
2019	5.3519861423715405
2020	13.890051767422326
2021	17.408209288859943
2022	6.97473944930372