Year	Number
2004	-0.949744343757629
2005	-0.975333094596863
2006	-1.10591995716095
2007	-1.13744509220123
2008	-1.19349539279938
2009	-1.22002625465393
2010	-1.2024450302124
2011	-1.05523908138275
2012	-1.04433333873749
2013	-1.11021757125854
2014	-1.10064721107483
2015	-0.973001599311829
2016	-0.973601579666138
2017	-0.815379917621613
2018	-0.847762167453766
2019	-0.835665345191956
2020	-0.832646548748016
2021	-0.847071647644043
2022	-0.766386210918427