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 2010 the data source is
Ember .
For the years 2011 to 2018 the data source is
IEA .
For the years 2019 to 2023 the data source is
Ember .