Year	% of revenue
1996	38.370754173862984
1997	41.05510142294884
1998	49.92520634250216
1999	42.578793361099784
2000	43.37047085453757
2001	50.22060640800372
2002	50.49093565150753
2003	43.66793365583967
2004	45.11559588724119
2005	46.655315466167465
2006	46.417332560687626
2007	45.93970416314106
2008	48.123556437891715
2009	46.02950046107163
2010	45.58881586326233
2011	51.14847992924134
2012	52.04076724768171
2013	52.01429253007215
2014	52.858113150590746
2015	46.35513421486245
2016	46.89399823934545
2017	47.71702845817355
2018	51.16815167501556
2019	46.5986671709062
2020	45.22485393992977
2021	50.673267876434224
2022	47.33387281650302