How often are censuses conducted to determine the population figures mentioned in the act?
According to the given context, censuses are conducted every ten years to determine the population figures mentioned in the act. This can be inferred from the Explanation part of the act where it states: "Provided that the reference in this Explanation to the last preceding census of which the relevant figures have been published shall, until the relevant figures for the first census taken after the year 5[2026] have been published, be construed as a reference to the 6[2001] census." This indicates that censuses were conducted every ten years from 2001 till 2026.