For the years 1980 to 1989 the data source is
EIA.
For the years 1990 to 1999 the data source is
IEA.
For the years 2000 to 2008 the data source is
Ember.
For the years 2009 to 2013 the data source is
IEA.
For the years 2014 to 2022 the data source is
Ember.