Year	% of expense
2005	4.130731970754741
2006	3.603826749256479
2007	3.7054388792218353
2008	3.2993382906995596
2009	3.532130849035798
2010	5.105042287308654
2011	3.880271886264967
2012	4.741724449308775
2013	3.5059741081906237
2014	4.694074126878343
2015	5.393211842015189
2016	5.298146236107753
2017	5.414004557382294
2018	6.7387721149315825
2019	5.6285807975331075
2020	6.974273147619379
2021	7.047471220175
2022	7.692386996260556