Year	% of revenue
1996	9.316968068684188
1997	8.297211067199607
1998	9.618770083605586
1999	9.159127901684078
2000	8.584213653218189
2001	8.315127191886459
2002	7.342183783638107
2003	5.107204560449431
2004	4.778575457039598
2005	4.421211739513793
2006	4.973515856091353
2007	7.2731693539393465
2008	5.254847148382108
2009	4.860823799813739
2010	3.8913693231660154
2011	3.195112631914064
2012	3.290041052699754
2013	3.1456713650011743
2014	3.862874849641356
2015	6.9652307585229805
2016	7.076404053651203
2017	6.178881532016274
2018	5.603426026615642
2019	6.551477244187542
2020	15.996637633602695
2021	12.578224068986618
2022	23.984070522407333