For the years 1980 to 1984 the data source is
EIA.
For the years 1990 to 1999 the data source is
IEA.
For the years 2000 to 2009 the data source is
Ember.
For the years 2010 to 2013 the data source is
IEA.
For the years 2015 to 2022 the data source is
Ember.