Year	Number
1996	-1.07273840904236
1998	-1.2457857131958
2000	-1.25603604316711
2002	-1.02277934551239
2003	-1.05539417266846
2004	-1.10369324684143
2005	-0.985814392566681
2006	-1.33515012264252
2007	-1.33315742015839
2008	-1.13534939289093
2009	-0.918233692646027
2010	-0.855281352996826
2011	-0.952119052410126
2012	-1.53074514865875
2013	-1.54563355445862
2014	-1.68455278873444
2015	-1.66471791267395
2016	-1.68493008613586
2017	-1.85244584083557
2018	-1.75966858863831
2019	-1.779421210289
2020	-1.89161384105682
2021	-1.64680981636047
2022	-1.82389974594116