Year	Number
1996	1.12499630451202
1998	1.07573640346527
2000	0.957407116889954
2002	0.945743262767792
2003	1.10140347480774
2004	0.894058406352997
2005	1.08176851272583
2006	1.13004350662231
2007	1.28093576431274
2008	1.34595167636871
2009	1.25000429153442
2010	1.29770147800446
2011	1.28997790813446
2012	1.37811684608459
2013	1.39721250534058
2014	1.38839173316956
2015	1.3007630109787
2016	1.24710404872894
2017	1.25295603275299
2018	1.20734238624573
2019	1.19540309906006
2020	1.3649343252182
2021	1.5862535238266
2022	1.61052799224854