year,value
1947,23.41
1948,24.05
1949,23.61
1950,24.98
1951,26.47
1952,26.71
1953,26.87
1954,26.77
1955,26.87
1956,27.63
1957,28.47
1958,28.97
1959,29.41
1960,29.81
1961,30.01
1962,30.38
1963,30.88
1964,31.25
1965,31.85
1966,32.92
1967,34.0
1968,35.6
1969,37.7
1970,39.8
1971,41.1
1972,42.5
1973,46.3
1974,51.9
1975,55.6
1976,58.4
1977,62.3
1978,67.9
1979,76.9
1980,86.4
1981,94.1
1982,97.7
1983,101.4
1984,105.5
1985,109.5
1986,110.8
1987,115.6
1988,120.7
1989,126.3
1990,134.2
1991,138.2
1992,142.3
1993,146.3
1994,150.1
1995,153.9
1996,159.1
1997,161.8
1998,164.4
1999,168.8
2000,174.6
2001,177.4
2002,181.8
2003,185.5
2004,191.7
2005,198.1
2006,203.1
2007,211.44
2008,211.4
2009,217.35
2010,220.47
2011,227.22
2012,231.22
2013,234.72
2014,236.25
2015,237.76
2016,242.64
2017,247.81
2018,252.77
2019,258.63
2020,262.05
2021,280.81
2022,298.81
2023,308.74
2024,317.6
2025,319.49