Year	1=low to 6=high
2005	3.013157894736842
2006	3
2007	3.025
2008	3.025
2009	3.073170731707317
2010	3.097560975609756
2011	3.097560975609756
2012	3.0232558139534884
2013	3.0113636363636362
2014	3.0697674418604652
2015	3.0348837209302326
2016	3.011627906976744
2017	2.9318181818181817
2018	2.953488372093023
2019	2.875
2020	2.852272727272727
2021	2.813953488372093
2022	2.784090909090909
2023	2.75