For the years 1985 to 1989 the data sources are
EIA
and
IEA (imports/exports).
For the years 1990 to 1999 the data source is
IEA.
For the year 2000 the data source is
Ember.
For the years 2001 to 2006 the data source is
IEA.
For the year 2007 the data source is
Ember.
For the years 2008 to 2010 the data source is
IEA.
For the years 2011 to 2012 the data source is
Ember.
For the years 2013 to 2018 the data source is
IEA.
For the years 2019 to 2022 the data source is
Ember.