Year	Number
1996	-0.241686642169952
1998	-0.67188423871994
2000	-0.602258622646332
2002	-0.656005680561066
2003	-0.616845548152924
2004	-0.49067422747612
2005	-0.519786179065704
2006	-0.496493607759476
2007	-0.46990641951561
2008	-0.407430082559586
2009	-0.360137552022934
2010	-0.355648875236511
2011	-0.331778317689896
2012	-0.197178289294243
2013	-0.139309406280518
2014	-0.132222980260849
2015	-0.264293223619461
2016	-0.191816985607147
2017	-0.200647950172424
2018	-0.22513185441494
2019	-0.22502775490284
2020	-0.315116077661514
2021	-0.302860885858536
2022	-0.306685209274292