Year	% of revenue
1990	1.4142336999564808
1991	1.5071384233395406
1992	1.4891706633379322
1993	1.4928770605307586
1994	1.9175346631266028
1995	1.6956054940579766
1996	1.2501538756137929
2006	0.8606683481467784
2007	0.8706622836836683
2008	0.929479438134161
2009	1.2360500676816124
2010	1.644355188761322
2011	1.5283272194512385
2012	1.6156768814498776
2013	1.4063840443725242
2014	1.2565578909310615
2015	1.7027696395194964
2016	1.5311648909505282
2017	1.7565582960447241
2018	2.041919145692026
2019	2.2196743401133827
2020	2.4074747792072233
2021	1.7023267829070752
2022	2.180576428854168