Year	% of expense
1991	0.1864280387770322
1992	0.5280066482219048
1993	0.4274814085915694
1994	0.6233061588164356
1995	5.600539751253994
1996	5.336586958676626
1997	5.181214067964738
1998	4.832748420129215
1999	4.634130441717605
2000	4.589858719463711
2001	4.836732911934294
2002	4.942109338241188
2003	5.097595039561441
2004	5.25674339185261
2005	5.484155920918584
2006	5.601611627057157
2007	5.545575969514826
2008	5.637014753233077
2009	6.192065893474258
2010	6.4494277727036335
2011	6.345159726194768
2012	6.685940490339141
2013	6.625406713726717
2014	6.3717716383953125
2015	6.335557038269132
2016	6.439241659768219
2017	6.379510332690648
2018	6.186070528646978
2019	5.973595404447768
2020	5.668729188115508
2021	5.6153812787457955
2022	11.837559079594305