#16 - China's Empress Dowager Cixi was officially only regent, not the titular head of state. Regardless, "since last century" implies since the year 2001, which means most of the countries are wrong anyway.
#16 - China's Empress Dowager Cixi was officially only regent, not the titular head of state. Regardless, "since last century" implies since the year 2001, which means most of the countries are wrong anyway.
See #5.