Year	% of expense
1992	2.0618556701030926
1993	2.14963707426019
1994	0.7358185981904869
1995	0.8290989960823425
1996	2.3066914358345683
1997	2.3777278710134966
1998	2.796632253964205
1999	2.360128458715247
2000	3.2542384598102414
2001	2.6411708873103312
2002	2.2057170673326603
2003	1.7831999933935379
2004	1.5987247051741809
2005	1.1481868837604112
2006	1.0394307886554024
2007	1.0211656939533444
2008	1.5731504046858338
2009	2.220836306804108
2010	1.7615560832441595
2011	3.2768183835368716
2012	3.9724324860344424
2013	2.870333138083704
2014	3.2833413494527064
2015	5.3355343813654015
2016	6.190155329647183
2017	6.0513629817195165
2018	6.228333926703549
2019	5.616134182066753
2020	5.186469403047882
2021	4.93901783257891
2022	3.226266289015541