Year	% of expense
2001	34.498411257376304
2002	31.519234178337175
2003	29.663794382060104
2004	4.790689501095724
2005	11.484595675927194
2006	26.782703421428888
2007	14.355527225666878
2008	23.045763289513896
2009	7.650930152312736
2010	7.984073284606461
2011	1.4251649381815794
2012	1.2348110619855388
2013	1.8761052823989999
2014	1.328139413154021
2015	2.575144376299873
2016	3.024155985965756
2017	8.555553011626133
2018	12.37747298372005
2019	18.198912979521932
2020	9.11732636793582
2021	11.505939423319772