Year	Number
2006	-0.340060144662857
2007	-0.215681239962578
2008	-0.239731281995773
2009	-0.405472666025162
2010	-0.583555221557617
2011	-0.435834616422653
2012	-0.324966311454773
2013	-0.355317503213882
2014	-0.28867506980896
2015	-0.424874186515808
2016	-0.438620895147324
2017	-0.419617772102356
2018	-0.44447934627533
2019	-0.370107769966125
2020	-0.332664608955383
2021	-0.257235944271088
2022	-0.194389581680298