Year	Number
1996	-0.433467239141464
1998	-0.698877692222595
2000	-0.786500871181488
2002	-0.947748064994812
2003	-0.813447833061218
2004	-0.995903432369232
2005	-1.15102338790894
2006	-1.13993716239929
2007	-1.11834168434143
2008	-1.1764702796936
2009	-1.24256598949432
2010	-1.03937900066376
2011	-1.03357470035553
2012	-0.938103914260864
2013	-0.959146857261658
2014	-0.909913182258606
2015	-0.952820062637329
2016	-0.942351043224335
2017	-0.913151979446411
2018	-0.868210077285767
2019	-1.00233256816864
2020	-0.596712231636047
2021	-0.77021861076355
2022	-0.696246027946472