170718 Initial release. https://zenodo.org/record/831455
180806 Second release. https://zenodo.org/record/1336892
	   Changed units of global emissions to match those of country-level emissions.
	   Updated to 2018 UNFCCC CRF submissions
	   Updated South Korea, Jamaica
	   Fixed double-counting of former-Soviet countries in global total
	   Added new estimates for Saudi Arabia, Togo, Israel, Lebanon, Serbia, Bosnia and Herzegovina, Morocco, Mongolia, and Colombia.
	   Added earlier estimates for Sweden.
	   Removed data for countries that no longer exist and non-countries (Antarctica and Kuwaiti Oil Fires)
181016 Third release. https://zenodo.org/record/1491562
	   Reduced data precision to four significant figures
       Changed NODATA to -9999
190828 Fourth release. https://zenodo.org/record/3380081
       Updated to 2019 UNFCCC CRF submissions
	   Updated Armenia, Azerbaijan, Brazil, Chile, China, Colombia, Indonesia, Jamaica, Mexico, Moldova, Saudi Arabia, South Africa, South Korea, and USA.
	   Added new estimates for Bangladesh, Barbados, Malaysia, Paraguay, and Rwanda.
	   Added post-CRF (2018) estimate for Japan.
	   Updated all other countries based on cement production data from USGS.