Year | Value | 2022 | 39.654394666178 | 2021 | 44.254242289252 | 2020 | 55.15104630561 | 2019 | 48.667146423045 | 2018 | 49.180212286879 | 2017 | 53.201448963595 | 2016 | 55.080425438404 | 2015 | 52.654808156421 | 2014 | 49.339495622705 | 2013 | 46.73962935721 | 2012 | 43.475976101632 | 2011 | 40.367243517245 | 2010 | 44.129564166693 | 2009 | 51.179999694576 | 2008 | 39.509551144723 | 2007 | 43.196575940703 | 2006 | 43.460579953079 | 2005 | 42.567722023678 | 2004 | 50.154483235274 | 2003 | 53.516120284855 | 2002 | 53.779226768736 | 2001 | 52.065165038157 | 2000 | 41.735519095394 | 1999 | 54.567049808429 | 1998 | 62.073232514178 | 1997 | 44.456112701425 | 1996 | 50.391101345784 | 1995 | 53.045814479638 | 1994 | 55.013516329629 | 1993 | 63.680568681247 | 1992 | 65.116098820478 | 1991 | 58.754002936621 | 1990 | 63.143280266568 | 1989 | 69.097716211157 | 1988 | 67.586025665124 | 1987 | 76.163439077277 | 1986 | 73.148383812675 | 1985 | 52.715761412862 | 1984 | 48.142912222079 | 1983 | 47.032422812041 | 1982 | 43.056606947599 | 1981 | 40.981419723678 | 1980 | 39.371820393718 | 1979 | 45.997517840521 | 1978 | 50.148367952522 | 1977 | 41.596638655462 | 1976 | 27.019885968572 | 1975 | 35.705017301038 | 1974 | 33.952111918214 | 1973 | 61.266281812539 | 1972 | 51.059843317972 | 1971 | 54.043872502379 | 1970 | 56.312858924501 |
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