Year	% of revenue
1984	63.45063187524536
1986	50.403030651220924
1987	43.55882393520882
1988	41.99036709190315
1989	39.10651327187892
1991	14.666909508370162
1992	16.23703981645655
1993	17.75887607778098
1994	16.567148223645958
1995	15.12486047647044
1996	16.185894418562384
1997	16.236474090378138
1998	14.658281138358683
1999	17.275744489716818
2000	13.818144506132283
2001	15.118857876984295
2002	13.658557007748124
2003	11.646005133526295
2004	14.274567294050886
2005	14.866868673844369
2006	17.85061377915967
2007	16.873711819314664
2008	16.16649064582729
2009	15.633364656143078
2010	8.650476373968429
2011	8.577739904545059
2012	13.616665287065619
2013	13.683129143739059
2014	14.470868943959225
2015	12.529060292941185
2016	9.647899578116993
2017	12.109634553783959
2018	10.554266938410922
2019	11.34839999238543
2020	14.457457102182373
2021	9.825342758079977
2022	8.760920447504732