Year	% of expense
1995	2.154998967952313
1996	2.1309773421754112
1997	2.0995831981431103
1998	2.1232059442024576
1999	2.227166457237914
2000	2.322568722399655
2001	2.3734576393058155
2002	2.464522270327452
2003	2.4096506357546827
2004	2.483440571814086
2005	2.281083147725808
2006	2.3419938313555337
2007	2.31813382138178
2008	2.5222063008226154
2009	2.3993447290669216
2010	2.462735750994124
2011	2.402601369847575
2012	2.2640647471870503
2013	2.237185602739014
2014	2.512790821589874
2015	2.5982373019041662
2016	2.5863540255641597
2017	2.4857990092345106
2018	2.5420575006061727
2019	2.5424361334008774
2020	2.4845165340547344
2021	2.5243923912249904
2022	2.8401639987357123