> Tourism graph is based on Google searches for services used by tourists relative to the rest of the year. That's a pretty clever way to go about it. I hope/suppose that the sampling bias isn't correlated with time-of-year somehow.
It's actually inaccurate. People search BEFORE they go. In fact, I can tell you the busiest tourism month in Greece is August. I've been there dozens of times and June is actually a pleasant (tho cool-ish) time to visit - no crowds. And the Greeks are still working (trying to make money to spend on their August vacations - when everything shuts down). Perhaps Airline charters would be a more accurate reflection. Altho I do not know where to source that data.