Year,Value,Contiguous U.S. (Lower 48),Solar,Aug,(MJ)
1940,22.001
1941,22.297
1942,21.851
1943,23.044
1944,22.349
1945,21.828
1946,22.13
1947,22.633
1948,22.757
1949,22.728
1950,22.565
1951,22.323
1952,22.777
1953,22.771
1954,22.721
1955,22.958
1956,22.985
1957,22.782
1958,22.837
1959,22.143
1960,22.29
1961,21.954
1962,23.338
1963,22.154
1964,22.072
1965,22.181
1966,21.809
1967,22.425
1968,21.826
1969,23.013
1970,22.845
1971,22.474
1972,21.884
1973,22.594
1974,21.61
1975,22.286
1976,22.414
1977,21.101
1978,22.146
1979,21.624
1980,21.971
1981,21.637
1982,21.331
1983,21.909
1984,21.745
1985,21.605
1986,21.504
1987,21.745
1988,22.094
1989,21.546
1990,21.925
1991,21.651
1992,21.255
1993,21.513
1994,21.989
1995,22.352
1996,22.112
1997,21.492
1998,22.505
1999,22.509
2000,22.727
2001,22.488
2002,22.532
2003,22.158
2004,21.548
2005,22.06
2006,22.213
2007,22.505
2008,21.985
2009,22.216
2010,22.536
2011,23.169
2012,22.811
2013,22.005
2014,21.522
2015,22.499
2016,21.716
2017,21.621
2018,22.186
2019,22.366
2020,22.982
2021,22.167
2022,21.791
2023,22.372
2024,22.52