Year	Number
1996	-0.971613764762878
1998	-0.909501016139984
2000	-0.882966220378876
2002	-0.939510047435761
2003	-0.879082381725311
2004	-0.772796213626862
2005	-0.95474761724472
2006	-0.886092662811279
2007	-0.771052896976471
2008	-0.656676888465881
2009	-0.697536051273346
2010	-0.75210177898407
2011	-0.821726500988007
2012	-0.803623497486115
2013	-0.774326741695404
2014	-0.87566202878952
2015	-0.944647133350372
2016	-1.00065386295319
2017	-0.934071719646454
2018	-0.950232684612274
2019	-0.946248352527618
2020	-1.04289186000824
2021	-1.02881515026093
2022	-1.10204446315765