Year | Value | 2021 | 339.68211440291 | 2020 | 476.89905973641 | 2019 | 469.47776010933 | 2018 | 467.28603443263 | 2017 | 498.0412211548 | 2016 | 485.79222940444 | 2015 | 550.2413600314 | 2014 | 577.26018435098 | 2013 | 598.89958461638 | 2012 | 607.61211781306 | 2011 | 568.57741049834 | 2010 | 506.92238397621 | 2009 | 404.60135467698 | 1981 | 292.12477499702 | 1980 | 271.9185362594 | 1979 | 266.96324103535 | 1978 | 239.47124824516 | 1977 | 218.11050754052 | 1976 | 192.47790378596 | 1975 | 182.38011715267 | 1974 | 171.61772719257 | 1973 | 141.95485460166 | 1972 | 134.74092833275 | 1971 | 158.3255323582 | 1970 | 155.08787539791 |
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