Yearly hemiSSNs calculated at different helio-latitude intervals in 1948–2021. Top panel: all-hemispheric means of daily sunspot numbers for the northern (all-hemi N; blue line) and southern (all-hemi S; red line) hemisphere, together with the yearly mean sunspot numbers (black line). Second panel: high-latitude sunspot numbers for the northern (High N) and southern hemisphere (High S). The seven small plots on the third and bottom rows depict an enlarged view of the second panel, for each of the seven solar cycle maxima.