Year	% of expense
1974	5.435299714557548
1975	5.700735578784357
1976	5.485588707632492
1977	5.77942735949099
1978	5.182197306351266
1979	5.360799156170502
1980	5.211339331183164
1981	5.453217137191461
1982	5.2840284745114925
1983	5.586617573526076
1984	5.6390646976090215
1985	5.839007153322394
1986	5.759293215535909
1987	6.06316976875354
1988	6.057917238041466
1989	6.543200126362329
1990	6.240498631802997
1991	5.714081639941419
1992	5.868791320562824
1993	5.847857423666623
1994	6.109253065774807
1995	5.077619342755029
1996	5.8297372574661726
1997	5.594897419195304
1998	6.0271563836108974
1999	6.008350636220601
2000	6.353522603510953
2001	6.677251396931593
2002	6.693259256821188
2003	6.3349389615280955
2004	6.02804494487626
2005	6.279688535122609
2006	6.063833688154845
2007	6.517884339094541
2008	5.994569697267847
2009	5.976846345936289
2010	6.24290359800494
2011	6.092123398732334
2012	6.123901762738268
2013	6.230083930430571
2014	6.462532618846459
2015	5.949502814732214
2016	5.404011828781245
2017	5.556866903673345
2018	5.824084188638561
2019	5.996748402375703
2020	5.572433356406154
2021	5.71413158771646
2022	6.3319406702401935