Number of subdistrict creations per year

The chart shows the number of subdistricts created in each year - in fact in contrast to my previous subdistrict statistics it's the date when the creation took effect, not the date when it was published, but for most cases this does not make much difference.

Quite notable is the low number in the 1950s, with some years skipping creations altogether. Since 1960 the number slowly rose from 30 to 100 in 1980. Since then it was rather stable at 100 new subdistricts each year, until the creations ceased altogether after 1997.