Year	Number
2008	-0.69719523191452
2009	-0.82518607378006
2010	-0.873330295085907
2011	-0.897295653820038
2012	-0.99498063325882
2013	-0.991693198680878
2014	-0.820562958717346
2015	-0.0783018469810486
2016	0.126572132110596
2017	-0.0134953707456589
2018	0.106942422688007
2019	0.465048998594284
2020	0.547488927841187
2021	0.531117498874664
2022	0.442982524633408