Year	Number
2007	-0.697122275829315
2008	-0.870570600032806
2009	-1.00755226612091
2010	-1.04669904708862
2011	-1.08113348484039
2012	-1.18786144256592
2013	-1.37598311901093
2014	-1.23888659477234
2015	-0.834047913551331
2016	-0.604751825332642
2017	-0.811249554157257
2018	-0.135701671242714
2019	-0.139852851629257
2020	-0.083867646753788
2021	-0.0707451999187469
2022	0.0192454010248184