Year	% of revenue
1990	47.574151311112495
1991	49.42023587833644
1992	46.65484089963427
1993	54.711004040442354
1994	48.3196042389997
1995	59.299914849505754
1996	67.07608978129146
2006	41.8266837884317
2007	39.48806010948112
2008	32.60137266925815
2009	33.00339243637092
2010	35.59846500884775
2011	35.2627874977169
2012	28.370103441020262
2013	34.4281187546969
2014	32.63023156157537
2015	25.73080071879843
2016	37.96752743635801
2017	29.198734302397817
2018	29.30538623792541
2019	30.033649862626348
2020	22.625029768389265
2021	32.39900420531485
2022	33.322595922519994