Year	% of expense
1996	0.009401252998999708
1997	0.369425807317596
1998	0.0041783449575623095
1999	10.24727667621379
2000	4.133470438795086
2001	2.821467423103094
2002	2.994956987897081
2003	6.275182368846907
2004	5.015760082085555
2005	8.917511469370929
2006	6.280701468393132
2007	5.395659561321524
2008	7.316533717834798
2009	6.032866631964392
2010	7.181257654926054
2011	4.648575232409578
2012	3.710309721349949
2013	2.105825299074939
2014	1.6041770705240137
2015	1.2603027556574975
2016	1.3076864921468723
2017	3.473041128023641
2018	3.3312219360379403
2019	2.4604047351062546
2020	7.735395973534928
2021	6.038695340478093
2022	7.713155920532013