Year	% of revenue
1995	19.96237949682577
2002	28.4036204520625
2003	29.019767831360426
2004	35.42264245107307
2005	30.50118493217836
2006	28.2786278244906
2007	24.01558910168047
2008	24.473392509784038
2009	26.284626623901737
2010	26.71319531253678
2011	28.889643606959915
2012	29.69169178309642
2013	27.25632764599754
2014	27.53843584128073
2015	27.228044358107546
2016	29.398855927001577
2017	27.18914430636113
2018	24.260895238769837
2019	27.701763511873956
2020	29.991997293159443
2021	28.25094613433803
2022	33.42761877849387