| Year | Value | | 2022 | 1.0972620849691 | | 2021 | 1.4624987226396 | | 2020 | 1.6198660296371 | | 2019 | 1.3019640717083 | | 2018 | 1.1420831873363 | | 2017 | 1.1289366159539 | | 2016 | 1.2394905189116 | | 2015 | 1.0414320758195 | | 2014 | 0.76617785375662 | | 2009 | 2.4749296039033 | | 2008 | 1.4823090674954 | | 2007 | 1.5018258244703 | | 1995 | 2.0456168533629 | | 1994 | 1.9864230402112 |
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