Year | Value | 2022 | 52.446027276241 | 2021 | 59.119662625198 | 2020 | 34.889784309078 | 2017 | 21.99694301733 | 2016 | 55.41238797632 | 2015 | 6.8939035916825 | 2014 | 3.3834127274947 | 2013 | 1.9234360410831 | 2012 | 5.0068631936729 | 2011 | 17.711779641456 | 2010 | 6.9410822164 | 2009 | 0.13363664671488 | 2008 | 14.667142743791 | 2007 | 6.4262793447051 | 2006 | 11.281304327398 | 2005 | 9.8980048956146 | 2004 | 9.9863251197488 | 2003 | 23.002232177822 | 2002 | 15.52739891857 | 2001 | 38.586287887261 | 2000 | 59.401686545079 | 1999 | 98.773091411216 | 1998 | 18.975369199448 | 1997 | 7.1451116088393 | 1996 | 0.70188725145282 | 1995 | 235.5588150736 | 1994 | 368.47806870627 | 1993 | 143.51155848349 | 1992 | 43.666178385417 | 1991 | 25.967462506022 | 1990 | 21.739944339753 | 1989 | 0.76964674220598 | 1988 | 7.3132878080382 | 1987 | 53.392953256324 | 1986 | 18.687960687961 | 1985 | 10.865952984119 | 1984 | 3.6887445276091 | 1983 | 4.4118080745527 | 1982 | 7.2764086177986 | 1981 | 8.7939698492461 | 1980 | 14.109706449692 | 1979 | 14.842308165533 | 1978 | 8.8235294117967 | 1977 | 9.7311327685374 | 1976 | 10.069538030279 | 1975 | 8.4473284227466 | 1974 | 16.87619568211 | 1973 | 12.940813334094 | 1972 | 3.2342866248859 | 1971 | 0.2155516526435 | 1970 | 2.5880425879729 | 1969 | 11.274509803922 | 1968 | 0.16366612111288 | 1967 | 10.688405797102 | 1966 | 4.7438330170778 | 1965 | 1.9342359767891 | 1964 | 4.233870967742 | 1963 | 2.0576131687242 | 1962 | 2.1008403361344 | 1961 | 1.7094017094017 | 1960 | 2.8571428571428 |
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