Polity scores reflect how democratic or autocratic countries are
from a scale of -10 (autocratic) to 10 (democratic). There are also three
special codes for foreign "interruption" (-66), anarchy (-77), and transition
periods (-88).
The data are included here for as an example for use with the missing plot.
Thus they do not contain all available Polity indicators, which are
available at the Polity project website www.systemicpeace.org.