Year	% of expense
1985	15.652249485790435
1986	14.782074312186822
1987	14.57983193277311
1988	6.79247147161982
1989	6.9062879408193805
1990	25.616482999191298
1991	26.9536914698205
1992	26.72243631920293
1993	29.201223730094778
1994	40.901983083374795
1995	6.253153341619187
1996	54.20414362674134
1997	53.368210549047454
1998	54.17712938714744
1999	52.66773313660421
2000	52.85047803940891
2001	53.16819647293036
2002	54.000136555208655
2003	54.61708527141862
2004	55.51190501516344
2005	56.736706470708306
2006	59.73643973602598
2007	60.1161075064663
2008	62.50750247264592
2009	61.65024022400547
2010	59.172628176243414
2011	59.23988408305685
2012	61.54568210499636
2013	61.44417921975654
2014	59.607189746593015
2015	58.25624067922253
2016	58.26038540366147
2017	57.360784847333456
2018	58.00722274008601
2019	54.3866544797703
2020	56.67933046767334
2021	54.338186818456414
2022	54.18849157490082