The objective of the building permit index is to show the future development of construction activity in terms of per square meter of useful floor. The current base year is 2021 (Index 2021 = 100). The index is presented in seasonally adjusted form. Growth rates with respect to the previous month (M/M-1) are calculated from seasonally adjusted figures while growth rates with respect to the same month of the previous year (M/M-12) are calculated from raw data.