Year	Number
1996	-0.655131697654724
1998	-0.63481616973877
2000	-0.795131266117096
2002	-0.73466682434082
2003	-0.817993104457855
2004	-0.933583378791809
2005	-0.975512564182281
2006	-1.18005156517029
2007	-1.27526688575745
2008	-1.30845546722412
2009	-1.31468594074249
2010	-1.35303711891174
2011	-1.36176204681396
2012	-1.42542839050293
2013	-1.4312607049942
2014	-1.56700253486633
2015	-1.52557373046875
2016	-1.6624892950058
2017	-1.59884250164032
2018	-1.62014710903168
2019	-1.63171458244324
2020	-1.49210953712463
2021	-1.58194589614868
2022	-1.7713862657547