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 2013 the data source is
Ember.
For the years 2014 to 2015 the data source is
IEA.
For the years 2016 to 2023 the data source is
Ember.
For the year 2023/2024 the data source is
aggregated data from the last 12 months (2023-05 to 2024-04).
For the months 2023-05 to 2024-04 the data source is
Ember.