Year | Value | 2021 | 71.411176162881 | 2020 | 103.69824241364 | 2019 | 61.930117381665 | 2018 | 59.712221172737 | 2017 | 52.280941839875 | 2016 | 46.432893581139 | 2015 | 49.407347345788 | 2014 | 44.395867587933 | 2013 | 24.223994143877 | 2012 | 23.48891928067 | 2011 | 18.049909357844 | 2010 | 17.321511480966 | 1998 | 161.23215785195 | 1997 | 150.07254894276 | 1996 | 175.93449073656 | 1995 | 155.27922461431 | 1994 | 149.20988985848 | 1993 | 161.7860768691 | 1992 | 164.70075355886 | 1991 | 277.5303079865 | 1990 | 244.38053643903 |
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