For obvious reasons, data from Ukraine and Russian Federation and so on starts from nothing at around 1990 (and makes up quite a large chunk, particularly for the 'Total CO2 Emissions' side) leaving me to wonder what happened before then? There is no USSR/CCCP entry and 'Other' isn't huge before and suddenly shrinks after 1990 to compensate. It would be interesting to compare with China, for instance, as a similar communist state. I guess this kind of graph must help to show up such missing data?