Year	Number
1996	-2.11674880981445
1998	-2.29753232002258
2000	-2.01407074928284
2002	-2.28477239608765
2003	-2.24483132362366
2004	-2.52275967597961
2005	-1.52337801456451
2006	-1.42777347564697
2007	-1.377925157547
2008	-1.63649833202362
2009	-1.27144265174866
2010	-1.6259593963623
2011	-1.80720043182373
2012	-1.7047381401062
2013	-1.35027754306793
2014	-0.784407138824463
2015	-1.93744611740112
2016	-1.96437513828278
2017	-2.00257396697998
2018	-1.57021856307983
2019	-1.62499344348907
2020	-1.54231476783752
2021	-1.25835752487183
2022	-1.18886947631836