Year,Value,Contiguous U.S. (Lower 48),Solar,Jun-Aug,(MJ)
1940,70.866
1941,69.708
1942,70.706
1943,72.851
1944,72.102
1945,69.926
1946,72.103
1947,71.713
1948,72.642
1949,72.397
1950,72.06
1951,71.873
1952,74.813
1953,73.845
1954,74.189
1955,73.153
1956,74.194
1957,72.971
1958,71.554
1959,72.52
1960,72.941
1961,72.212
1962,73.654
1963,72.527
1964,72.457
1965,72.16
1966,73.219
1967,71.246
1968,71.763
1969,72.209
1970,73.555
1971,73.37
1972,71.334
1973,72.197
1974,72.959
1975,71.927
1976,72.446
1977,71.239
1978,72.612
1979,71.264
1980,73.162
1981,70.43
1982,69.46
1983,70.994
1984,70.837
1985,71.104
1986,70.983
1987,71.391
1988,73.192
1989,70.146
1990,71.585
1991,70.937
1992,68.393
1993,69.496
1994,71.48
1995,71.82
1996,71.689
1997,70.259
1998,71.4
1999,71.705
2000,72.327
2001,72.23
2002,72.912
2003,72.132
2004,69.772
2005,72.091
2006,72.933
2007,72.465
2008,72.815
2009,70.73
2010,71.726
2011,74.026
2012,74.316
2013,71.245
2014,70.771
2015,71.884
2016,72.831
2017,72.086
2018,72.479
2019,72.621
2020,73.745
2021,71.905
2022,72.371
2023,73.102
2024,72.937