Year	% of expense
1994	14.266949246086938
1995	17.18186519565592
1996	15.101931980704434
1997	17.97842268915481
1998	18.212247332104205
1999	12.770806520806522
2000	12.954381413642688
2001	13.289854793236099
2002	13.685183118155548
2003	14.19456623114001
2004	13.82476390346275
2005	14.322348453274625
2006	14.107089759913388
2007	14.26014362700111
2008	14.369593493471614
2009	14.154602091742902
2010	14.075303724771441
2011	14.1192344761118
2012	13.709371109438633
2013	13.700857026254932
2014	14.19256680575085
2015	14.182085039041633
2016	14.138412792300715
2017	14.06374269005848
2018	14.011918682464323
2019	14.052514347711076
2020	12.34256374248475
2021	12.905442927584993
2022	12.646407204427422