Year	% of revenue
2005	22.67168518325438
2006	50.60084197884992
2007	49.3866375188276
2008	46.34197991430576
2009	43.30554631335729
2010	44.859806030657396
2011	44.879153065386895
2012	44.58028281908869
2013	43.86051134603147
2014	42.977924212765636
2015	44.33091316420241
2016	44.26704470399368
2017	43.55386562101373
2018	43.55882786537407
2019	43.68432858816921
2020	41.155038759268045
2021	43.257570161674536
2022	43.28732071047306