# year    value 
 1950 685.0605 
 1951 1190.696 
 1952 482.4417 
 1953 1001.259 
 1954 1012.322 
 1955 682.8477 
 1956 966.6801 
 1957  1129.95 
 1958 871.4897 
 1959  1320.43 
 1960 1237.863 
 1961 797.4558 
 1962 874.8505 
 1963 1221.503 
 1964 875.6101 
 1965 644.2807 
 1966 1149.918 
 1967 699.5504 
 1968 1088.291 
 1969 975.4333 
 1970 818.0544 
 1971 1182.233 
 1972 1619.979 
 1973  987.767 
 1974 1055.386 
 1975 1343.399 
 1976 1367.361 
 1977 1553.481 
 1978 1215.906 
 1979 1087.263 
 1980 892.0977 
 1981 1166.319 
 1982 1039.904 
 1983 868.6581 
 1984 1120.927 
 1985 824.9409 
 1986 993.7351 
 1987 1021.808 
 1988 1033.936 
 1989 645.0846 
 1990 848.7906 
 1991 881.9749 
 1992 1118.147 
 1993 1108.071 
 1994  1333.01 
 1995 978.6506 
 1996 1225.241 
 1997 607.7268 
 1998 678.2877 
 1999  935.725 
 2000  1142.68 
 2001 776.3383 
 2002 1394.436 
 2003 612.4649 
 2004 948.5278 
 2005 761.3299 
 2006 722.4569 
 2007  769.465 
 2008 1284.162 
 2009 1064.063 
 2010 1257.655 
 2011 993.1021 
 2012  1015.54 
 2013 1212.643 
 2014 1296.295 
 2015 1033.226 
 2016 1079.761 
 2017 653.9097 
 2018 1323.956 
 2019  1149.97 
 2020 707.1371 
 2021 741.7469 
 2022 551.8801