Year	Number
1996	-1.25874590873718
1998	-1.23111176490784
2000	-0.80017364025116
2002	-0.803475081920624
2003	-0.766690611839294
2004	-0.833764553070068
2005	-0.601551175117493
2006	-0.590213000774384
2007	-0.819362878799438
2008	-0.823874354362488
2009	-1.03079056739807
2010	-0.915285527706146
2011	-0.959997057914734
2012	-1.22053194046021
2013	-1.24993252754211
2014	-1.08603596687317
2015	-1.49530971050262
2016	-2.00721478462219
2017	-1.78637540340424
2018	-1.31516599655151
2019	-1.37813580036163
2020	-1.14386320114136
2021	-1.1367609500885
2022	-1.03986501693726