Year	% of expense
1995	4.970256133885187
1996	4.839864770829464
1997	4.907111325658232
1998	5.195493932731678
1999	5.401783530779836
2000	5.607955923955386
2001	5.587416743504862
2002	5.684225222136831
2003	5.316377174991651
2004	5.660467712598365
2005	5.619400748906531
2006	5.603608346586343
2007	5.82696253193145
2008	5.44600447114056
2009	5.767119880622639
2010	5.537536321778665
2011	5.496787824859393
2012	5.4922897386518645
2013	5.372225874251526
2014	5.2413536070488
2015	5.195685148251112
2016	5.40822331589238
2017	5.298014554911725
2018	5.189512403415645
2019	5.582104691419553
2020	5.06345436917583
2021	5.059569324334294
2022	5.379641875547185