Year	% of expense
2006	33.51130588646791
2007	35.33673445616978
2008	46.13466876551366
2009	33.884697261523755
2010	37.45387181547272
2011	36.43941120400868
2012	30.777424234160094
2013	27.17148545385526
2014	24.201137469263738
2015	8.946902450349842
2016	8.3352653607837
2017	8.335573607659189
2018	9.702797265412261
2019	8.955773635772115
2020	7.476410695631168
2021	12.40387822895684
2022	15.329965941228371