Year	% of expense
2005	1.624470773938255
2006	1.5321855878016466
2007	1.286841836038921
2008	1.18610288070247
2009	1.1397593741503071
2010	1.0887467017181247
2011	1.4378643979386092
2012	1.7688886591065107
2013	1.7936821878728895
2014	1.9614890924581636
2015	2.2705990115119294
2016	2.190187031034354
2017	1.939986628243244
2018	1.9195572035758741
2019	1.8091141773568749
2020	1.775893260183632
2021	1.6033265499586526
2022	1.5907098197283187