Year	% of revenue
2002	12.552245097124853
2003	11.090004078896962
2004	10.890187022775109
2005	8.914387544403555
2006	7.94322329639236
2007	7.4125134803827315
2008	7.633663770417525
2009	6.676163534374185
2010	6.1872098702879565
2011	5.524876492814335
2012	5.637406336040727
2013	6.539282322328883
2014	7.1441449558441406
2015	6.286253999764064
2016	7.166752434908604
2017	8.59447390010504
2018	10.619083040878966
2019	10.437210976333127
2020	10.856416101443829
2021	8.07965540683504