Year	Number
2004	-0.515539228916168
2005	-0.515336811542511
2006	-0.690099477767944
2007	-0.719671785831451
2008	-0.792954564094543
2009	-0.574568629264832
2010	-0.579521000385284
2011	-0.599480748176575
2012	-0.645014047622681
2013	-0.655830562114716
2014	-0.427611589431763
2015	-0.423639237880707
2016	-0.431269496679306
2017	-0.403690338134766
2018	-0.362755715847015
2019	-0.319078892469406
2020	-0.380405098199844
2021	-0.315788686275482
2022	-0.347820729017258