Year	% of expense
1995	51.41864504921829
1996	38.24707103663058
1997	36.96008747949699
1998	42.03421389503084
1999	42.73884691025774
2000	60.206321334503954
2001	65.06810972196305
2002	61.552519362979716
2003	62.41691359013374
2004	63.37215294238895
2005	62.66318537859008
2006	55.72029963474277
2007	42.960410755303336
2008	45.91313299845577
2009	49.62890625
2010	51.53966738139426
2011	50.83536171410594
2012	49.90400803378917
2013	49.6045197740113
2014	48.7083984140334
2015	47.095290366421
2016	46.792920860563854
2017	47.22282256321591
2018	51.99041034790366
2019	53.03508047874536
2020	56.38462124306772
2021	55.33003220416959
2022	54.71442645868995