Year	Number
2011	-1.11408913135529
2012	-1.33308959007263
2013	-1.44237983226776
2014	-1.61876738071442
2015	-1.59546875953674
2016	-1.79807734489441
2017	-1.82384753227234
2018	-1.98860204219818
2019	-1.98752045631409
2020	-1.81369841098785
2021	-1.72273635864258
2022	-1.69861781597137