Year	% of revenue
1998	1.9685162521358663
1999	14.706674121471911
2000	15.625128167042254
2001	16.39948998406406
2002	19.920149005528927
2003	21.349767995341633
2004	23.664771582325894
2005	28.743561535590295
2006	24.440874361179983
2007	27.92845553432733
2008	38.0837102631076
2009	27.48435765713556
2010	30.844379028410145
2011	33.66328894844094
2012	29.68691615836811
2013	26.594924231203365
2014	25.235718262597455
2015	44.03758518697366
2016	43.2947730867446
2017	43.577309652733064
2018	43.26667797285084
2019	44.47724606787556
2020	47.39783258820591
2021	44.07472654651585
2022	53.236155352628