According to Wikipedia, The Kingdom of Denmark also comprises two autonomous constituent countries in the North Atlantic Ocean: the Faroe Islands and Greenland. Denmark has a population of 5.75 million. Denmark introduced social and labour-market reforms in the early 20th century that created the basis for the present welfare state model with a highly developed mixed economy. The Constitution of Denmark was signed on 5 June 1849, ending the absolute monarchy, which had begun in 1660. It establishes a constitutional monarchy organized as a parliamentary democracy. Denmark is considered to be one of the most economically and socially developed countries in the world. Danes enjoy a high standard of living and the country ranks highly in some metrics of national performance, including education, health care, protection of civil liberties, democratic governance, prosperity and human development. The country ranks as having the world's highest social mobility, a high level of income equality, is the country with the lowest perceived level of corruption in the world, has one of the world's highest per capita incomes, and one of the world's highest personal income tax rates.