Year	Number
1996	-2.68281292915344
1998	-2.84785175323486
2000	-2.47423815727234
2002	-1.97592794895172
2003	-2.02786993980408
2004	-2.38776421546936
2005	-2.12856149673462
2006	-2.24673223495483
2007	-2.1784999370575
2008	-2.00307631492615
2009	-2.00098276138306
2010	-2.19674205780029
2011	-2.21298933029175
2012	-2.08589291572571
2013	-2.19219064712524
2014	-2.16792130470276
2015	-2.1388533115387
2016	-2.22458934783936
2017	-2.33943891525269
2018	-2.0807466506958
2019	-1.62443852424622
2020	-1.78548359870911
2021	-1.65781247615814
2022	-1.97774624824524