The universities in California are a rich source of information about olives and olive oil. I just discovered a Powerpoint presentation that includes production statistics, trends, consumption statistics, photographs of industrial mills, etc., separated out by country and in sum. I've found this type of presentation in a few horticulture course material online, but this one is rather rich with information.
I think I might hit a new motherlode if I went and explored universities in Italy, Provence, New Zealand, etc.... Of course, I'm limited to a large degree by only knowing English.
PDF of World Olive Oil Statistics