Year	% of expense
1995	5.64686097683467
1996	5.612626342906777
1997	5.379580255653785
1998	5.407580388244317
1999	5.643807100002754
2000	5.693061526203701
2001	5.615016176332677
2002	5.764762211866381
2003	5.868422879551915
2004	5.733722114860588
2005	6.022396831273968
2006	5.764240889801657
2007	5.496473504034224
2008	5.347657002545779
2009	5.427575756820658
2010	5.323195858283406
2011	5.540663186120865
2012	5.33678544742632
2013	5.327904462211015
2014	6.481795748805987
2015	5.757396311056193
2016	6.420435796711417
2017	6.56667683231328
2018	6.344321099247406
2019	6.180983858122217
2020	5.363698485578419
2021	5.140857120867543
2022	5.21418091330513