year,   tlt_noaa_v50,    tlt_uah_v61,    tlt_rss_v40, tlt_era5_equiv
1981,        -0.3027,        -0.2896,        -0.4457,        -0.2366
1982,        -0.4245,        -0.4740,        -0.6471,        -0.4327
1983,        -0.1624,        -0.2209,        -0.4160,        -0.2176
1984,        -0.4333,        -0.4158,        -0.6787,        -0.4689
1985,        -0.4692,        -0.5388,        -0.7339,        -0.4981
1986,        -0.3048,        -0.3974,        -0.6172,        -0.3901
1987,         0.0022,        -0.1313,        -0.3207,        -0.1361
1988,        -0.0191,        -0.1412,        -0.3527,        -0.0816
1989,        -0.2653,        -0.3874,        -0.5554,        -0.2911
1990,        -0.0461,        -0.1664,        -0.3799,        -0.0493
1991,        -0.0255,        -0.1589,        -0.3333,        -0.0685
1992,        -0.3202,        -0.4586,        -0.6055,        -0.3331
1993,        -0.3061,        -0.3809,        -0.5423,        -0.3283
1994,        -0.1833,        -0.2432,        -0.4064,        -0.2453
1995,        -0.0842,        -0.1102,        -0.2652,        -0.1294
1996,        -0.1869,        -0.1883,        -0.3657,        -0.2371
1997,        -0.1902,        -0.1871,        -0.3312,        -0.2219
1998,         0.2750,         0.3016,         0.1365,         0.1853
1999,        -0.2422,        -0.1959,        -0.3296,        -0.2641
2000,        -0.2518,        -0.1998,        -0.3354,        -0.2950
2001,        -0.0925,        -0.0655,        -0.1681,        -0.1276
2002,         0.0040,         0.0355,        -0.0551,         0.0195
2003,        -0.0174,         0.0053,        -0.0408,         0.0001
2004,        -0.1193,        -0.0999,        -0.1121,        -0.0889
2005,         0.0089,         0.0179,         0.0212,         0.0532
2006,        -0.0749,        -0.0668,        -0.0698,        -0.0188
2007,        -0.0309,        -0.0204,        -0.0343,         0.0004
2008,        -0.2814,        -0.2798,        -0.2431,        -0.2273
2009,        -0.0737,        -0.0870,        -0.0810,        -0.0285
2010,         0.1655,         0.1487,         0.1642,         0.2069
2011,        -0.1405,        -0.1633,        -0.1624,        -0.0858
2012,        -0.1150,        -0.1270,        -0.0973,        -0.0366
2013,        -0.0271,        -0.0442,        -0.0203,         0.0630
2014,         0.0244,         0.0004,         0.0366,         0.0935
2015,         0.1227,         0.0921,         0.1697,         0.1993
2016,         0.3583,         0.3421,         0.3702,         0.4579
2017,         0.2087,         0.2198,         0.2428,         0.3371
2018,         0.0704,         0.0433,         0.1032,         0.2270
2019,         0.2616,         0.2485,         0.3120,         0.4282
2020,         0.3295,         0.3018,         0.3742,         0.4648
2021,         0.1526,         0.0898,         0.1804,         0.2773
2022,         0.1608,         0.1020,         0.1683,         0.2844
2023,         0.4434,         0.3820,         0.4648,         0.5641
2024,         0.7528,         0.7228,         0.7747,         0.8576
2025,         0.4892,         0.4239,         0.4844,         0.5966