Received: 8 October 2019
Accepted: 30 April 2020
First Online: 11 May 2020
Ethics approval and consent to participate
: Ethics approval is not required for this paper because our data were not collected from human subjects or/and animals, and all variables used for our study were collected from publically available databases, such as the World Bank (ExternalRef removed), the Database of Political Institutions 2017 (ExternalRef removed), Polity IV Project (ExternalRef removed), and Autocratic Regime Data (ExternalRef removed). We merged data from a range of sources.
: Not Applicable.
: We declare no competing interests.