Year	% of revenue
2007	42.65420171118447
2008	41.961221385234346
2009	43.48701510421068
2010	45.096479259422054
2011	45.59933356422191
2012	45.91382926965441
2013	39.438275858850986
2014	40.0834315838893
2015	41.13466896673275
2016	41.98581249366436
2017	41.33322376901984
2018	40.7160099023625
2019	40.412862857512756
2020	39.839493148833455
2021	39.839493148833455
2022	40.88013289061481