According to Shia Muslims, one of the lingering problems in estimating Shia population is that unless Shia form a significant minority in a Muslim country, the entire population is often listed as Sunni. The reverse, however, has not held true, which may contribute to imprecise estimates of the size of each sect. For example, the 1926 rise of the House of Saud in Arabia brought official discrimination against Shia. Shiites are estimated to be 21% of the Muslim population in South Asia, although the total number is difficult to estimate due to that reason.