year,value 1950,222.1052632 1951,132.6315789 1952,72.63157895 1953,104.2105263 1954,116.8421053 1955,166.3157895 1956,60 1957,83.15789474 1958,115.7894737 1959,81.05263158 1960,76.84210526 1961,198.9473684 1962,52.63157895 1963,118.9473684 1964,161.0526316 1965,92.63157895 1966,146.3157895 1967,132.6315789 1968,49.47368421 1969,156.8421053 1970,70.52631579 1971,102.1052632 1972,37.89473684 1973,50.52631579 1974,71.57894737 1975,80 1976,88.42105263 1977,26.31578947 1978,66.31578947 1979,97.89473684 1980,156.8421053 1981,105.2631579 1982,33.68421053 1983,17.89473684 1984,88.42105263 1985,92.63157895 1986,37.89473684 1987,35.78947368 1988,108.4210526 1989,142.1052632 1990,102.1052632 1991,37.89473684 1992,80 1993,41.05263158 1994,33.68421053 1995,240 1996,174.7368421 1997,43.15789474 1998,191.5789474 1999,186.3157895 2000,125.2631579 2001,115.7894737 2002,70.52631579 2003,185.2631579 2004,238.9473684 2005,263.1578947 2006,83.15789474 2007,77.89473684 2008,153.6842105 2009,55.78947368 2010,173.6842105 2011,132.6315789 2012,135.7894737 2013,37.89473684 2014,70.52631579 2015,66.31578947 2016,148.4210526 2017,234.7368421 2018,138.9473684 2019,138.9473684 2020,189.4736842 2021,151.5789474 2022,97.89473684