For the years 1980 to 1987 the data sources are
EIA
and
IEA (imports/exports).
For the years 1988 to 1994 the data source is
EIA.
For the years 1995 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 2014 to 2023 the data source is
Ember.