Based on videos from one of the major lava-themed entertainment venues who has been posting updates for two months, the “barriers” for Grindavik were barely started, with work only beginning some time after January 4th or 5th. The primary focus of the public work was in building the barriers to protect the regional power plant to the east of the fissures (and hot springs resort area just east and north the power plant). IIRC, those barriers took a month to construct.
The subsurface dam/inclusion runs pretty much directly under Grindavik, so if an active eruption opens along the southern edge of the magma inclusion there will be no way to prevent damage to those houses adjacent.
Disc: I’m neither a seismologist nor a volcanologist, but I’ve seen Journey to the Center of the Earth. Oh, and I was in Grindavik in October.
At the risk of linking an un-cited web page, they look to be a distant 12th in gasoline.
https://www.indexmundi.com/energy/?product=gasoline&graph=exports&display=rank
The source is supposedly https://www.eia.gov/ but I can’t find the original data there in any usable format.
Russia comes in a distant second for general refined petroleum (not just gasoline) according to https://www.cia.gov/the-world-factbook/field/refined-petroleum-products-exports/country-comparison/