Year	% of revenue
1993	31.71426270100891
1994	32.05093858981228
1995	30.259657297459793
1996	31.5544811235292
1997	31.02824866013943
1998	30.85239210488663
1999	32.5274959350748
2000	31.896103117669334
2001	26.78351700441351
2002	26.103173845560967
2003	23.670932851638053
2004	27.509960671922286
2005	27.430314930314932
2006	26.52236427585306
2007	26.960969378103666
2008	26.62530339470447
2009	28.188625665207578
2010	28.514805297363736
2011	29.864481840324025
2012	30.89468130486518
2013	31.38373562561947
2014	29.85335634192305
2015	30.323963255254505
2016	30.29350145290104
2017	30.094774272878606
2018	28.492569671291534
2019	28.348226430004033
2020	26.9954043082141
2021	26.503940159934025
2022	25.529695945145885