The combination of both is correct. It's alcohol consumption in pure liters per capita. Scale goes from green through red and pink to yellow.
Map comes from this pretty cool site for map lovers, which you may or may not know. It lets you upload your own data it seems. In this case according to the guy who uploaded the data are from 2003 and come from data.un.org. The two most popular maps on that site are penis size and breast cup size by country by the way, in case your interested.
The colors represent a different standard of something we use every day. Grey is unknown.
Note: if some tiny islands / city states are not colored, that could be my fault.
I know Belgium uses ~ 230v, although it is often still labelled as 220v as a habit, because there was no uniform system in the beginning of electric distribution.
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