Year	% of expense
1994	8.335645244691396
1995	9.1888995215311
1996	10.459571130229724
1997	9.608971024691735
1998	32.26380982651943
1999	13.887758495453632
2000	13.905505656735903
2001	11.325929401950049
2002	12.751825621078124
2003	13.11913804190883
2004	11.66570176164089
2005	11.635688567172448
2006	11.71712747237809
2007	12.097738476878279
2008	15.914766436802152
2009	13.244327782135358
2010	11.626878563585157
2011	11.925646458531522
2012	11.515094683075091
2013	11.342997954088355
2014	10.198000146967372
2015	10.33563719821998
2016	10.226546964332236
2017	10.34886979316104
2018	10.228509979006862
2019	10.007562967433403
2020	16.76943643961023
2021	11.255215742950123
2022	12.073497748903431