Year	% of expense
1994	61.64023111176535
1995	42.61894295446459
1996	46.28494201928668
1997	48.433916696156516
1998	48.012475393117185
1999	50.7593582791449
2000	47.42678611250645
2001	46.98735302491329
2002	47.36526892472453
2003	46.941178016811655
2004	47.47409259206406
2005	45.67351355911426
2006	45.930053544366004
2007	47.851414344518325
2008	48.249687415831445
2009	55.14407707425942
2010	52.317875897384255
2011	51.021779594981744
2012	51.95376526372254
2013	54.18746119502372
2014	52.720489802585426
2015	53.48425778937247
2016	54.53591250951111
2017	54.63922580548325
2018	54.528893948432156
2019	56.539762977692966
2020	56.697016268716126
2021	60.11010985407923
2022	56.812990319046165