Year	Number
1996	1.11373817920685
1998	1.09760177135468
2000	1.26092338562012
2002	1.25724005699158
2003	1.17721080780029
2004	1.16569674015045
2005	1.21021103858948
2006	1.18129122257233
2007	1.19518756866455
2008	1.21035730838776
2009	1.19409048557281
2010	1.22541570663452
2011	1.26333856582642
2012	1.28765678405762
2013	1.25525140762329
2014	1.34896945953369
2015	1.22005689144135
2016	0.960226476192474
2017	0.979842782020569
2018	0.939828157424927
2019	0.923450410366058
2020	0.927434802055359
2021	0.891350984573364
2022	0.690400660037994