Code that locks on to the voting data table in Wikipedia ESC pages for each given year. This turns out to be a more stable point to determine which countries were in the competition that year, as the Categories page in Wikipedia (which turns into DBpedia entrant lists, and was being used through a sparql query to obtain the year+country for the DL) was found to incomplete for some years, missing out at time 1-3 countries, e.g. Austria 1988