There are 19 monarchies, 1 grand duchy, 3 principalities, 1 church state, 3 emirates, 1 sheikhdom and 2 sultanates in the world. 139 states are republics, people's republics, or democratic republics.
2003
2015
2006
1973
1949
1977
2014
1989
2011
2025
2005
1993
1937
1947
1999
2009
2018