From: Geomagnetic core field models and secular variation forecasts for the 13th International Geomagnetic Reference Field (IGRF-13)
Main field
Secular variation
M1 2017
M2 2017
2020
271.41
863.49
21.00
22.11
2025
306.11
1511.43
34.70
40.79
2030
306.54
359.97
35.13
90.02