Year	% of expense
2001	6.91848398048889
2002	6.0530346822530605
2003	5.527664647964828
2004	6.742360897496361
2006	5.531131336206267
2007	5.035164094676657
2008	6.106631452589424
2009	4.7810375802543215
2010	5.935121981775104
2011	5.782613179067707
2012	5.877651348904868
2013	5.942090195200661
2014	6.618150299555039
2015	6.447040632248088
2016	8.134207129132317
2017	8.745384720797576
2018	10.258910598471754
2019	8.501954039421285
2020	5.149273462089262
2021	5.5303888675512045
2022	6.113015804037288