Year	Number
1996	-2.06191730499268
1998	-2.31805849075317
2000	-2.03817391395569
2002	-1.5761798620224
2003	-1.0073858499527
2004	-1.0631206035614
2005	-0.885178327560425
2006	-0.539453446865082
2007	-0.666658759117126
2008	-0.361787378787994
2009	-0.34759184718132
2010	-0.226182341575623
2011	-0.369237810373306
2012	-0.389322549104691
2013	-0.39123347401619
2014	-0.333232045173645
2015	-0.50538581609726
2016	-0.321580082178116
2017	-0.38913482427597
2018	-0.347750902175903
2019	-0.370094686746597
2020	-0.600726008415222
2021	-0.709369480609894
2022	-0.646240890026093