Year | Value | 2022 | 1.4996690860627 | 2021 | 1.6093710361591 | 2020 | 1.8970150281402 | 2019 | 2.1399970962933 | 2018 | 2.1713559797715 | 2017 | 2.1704901553879 | 2016 | 2.1623369482992 | 2015 | 2.1108662791369 | 2014 | 2.0066867083619 | 2013 | 1.8733667602877 | 2012 | 1.748906223209 | 2011 | 1.5209443797303 | 2010 | 1.3338043198101 | 2009 | 1.2385925991458 | 2008 | 1.0781224108814 | 2007 | 0.94087993117142 | 2006 | 0.85544779355883 | 2005 | 0.83599259855571 | 2004 | 0.85055068166903 | 2003 | 0.87155573049131 | 2002 | 0.88645773828574 | 2001 | 0.87830964453748 | 2000 | 0.92186951081635 | 1999 | 0.9657401343801 | 1998 | 0.97671115136782 | 1997 | 1.0440703907652 | 1996 | 1.1392019760716 | 1995 | 1.2446175685687 | 1994 | 1.3648602743765 | 1993 | 1.500736539043 | 1992 | 1.6417101372137 | 1991 | 1.7720932099481 | 1990 | 1.8966263724576 | 1989 | 2.2436474874205 | 1988 | 2.552788959099 | 1987 | 2.5851927761133 | 1986 | 2.5797027884722 | 1985 | 2.5370380478245 | 1984 | 2.4818004337054 | 1983 | 2.438105338904 | 1982 | 2.4185093783408 | 1981 | 2.4115796527109 | 1980 | 2.404244526509 | 1979 | 2.5406796442397 | 1978 | 2.7195389172877 | 1977 | 2.8008021115675 | 1976 | 2.8788879413517 | 1975 | 2.9065618068311 | 1974 | 2.8694202066557 | 1973 | 2.7819579395251 | 1972 | 2.6791456545549 | 1971 | 2.5863671741357 | 1970 | 2.5037236377247 | 1969 | 2.5264023477704 | 1968 | 2.6526269311372 | 1967 | 2.7456701475938 | 1966 | 2.7546530079465 | 1965 | 2.6859349066445 | 1964 | 2.5808979184469 | 1963 | 2.8828091701655 | 1962 | 3.2881920515747 | 1961 | 3.3781150755471 |
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