Year	Number
2010	-0.819455504417419
2011	-1.09239530563354
2012	-1.29581928253174
2013	-1.400599360466
2014	-1.6076123714447
2015	-1.72435462474823
2016	-1.75906789302826
2017	-1.75134778022766
2018	-1.74286258220673
2019	-1.79988598823547
2020	-1.93670582771301
2021	-1.83681619167328
2022	-1.85575520992279