Year	Number
1996	1.22604835033417
1998	1.24346601963043
2000	1.25590968132019
2002	1.22839558124542
2003	1.21656310558319
2004	1.19513034820557
2005	1.18626391887665
2006	1.16447603702545
2007	1.15891206264496
2008	1.18814706802368
2009	1.13205051422119
2010	1.11228764057159
2011	1.12966418266296
2012	1.10328590869904
2013	1.18698859214783
2014	1.15485370159149
2015	1.17884492874146
2016	1.19146013259888
2017	1.18986344337463
2018	1.12343680858612
2019	1.08523750305176
2020	1.13049566745758
2021	1.09660077095032
2022	1.1020542383194