Year	Number
1996	1.26643979549408
1998	1.2458621263504
2000	1.22314357757568
2002	1.18108355998993
2003	1.17078423500061
2004	0.859443843364716
2005	1.11161744594574
2006	1.10253143310547
2007	0.99803227186203
2008	1.02270376682281
2009	0.887313961982727
2010	0.855329275131226
2011	0.854432463645935
2012	0.914866805076599
2013	0.847472012042999
2014	0.890397012233734
2015	0.971896648406982
2016	0.939097106456757
2017	0.859337687492371
2018	0.937738716602325
2019	0.722416639328003
2020	0.784048199653625
2021	0.826616287231445
2022	0.848512649536133