Year	% of revenue
2002	4.970933755136332
2003	4.465255284399032
2006	4.1010215815219295
2007	2.8099251346223975
2008	4.059392810993221
2009	3.2817380185946208
2010	3.5448263392058204
2011	3.318777802213272
2012	4.348374202716511
2013	5.131569475452839
2014	5.4335787376498175
2015	4.794203010914434
2016	5.482367385151073
2017	4.806842355438929
2018	7.757719792622664
2019	5.183886947072978
2020	4.4543089742907895
2021	4.805067791469128
2022	7.024439770887518