Year	% of revenue
2010	1.3039673726959233
2011	1.3296162461644259
2012	1.3555919238912828
2013	1.366539259811388
2014	1.586053705370924
2015	1.9735646048944868
2016	1.8760931348884453
2017	2.519186362765568
2018	3.218915600157558
2019	0.17912665809646328
2020	0.24474101794754777
2021	0.32403355220810487
2022	0.22112376563334166