I will have to look it up. My guess would be what ever year had the highest average fuel prices. I get a flat rate per mile and a fuel surcharge that fluctuates with the price of fuel. So, the higher the price of fuel, the higher my yearly revenue. There have been many years where I drove less miles, had a lower gross revenue and netted more than I do today. While gross revenue is certainly a necessary figure to consider, I put more stock in how much of that revenue I get to keep as profit. I guess I'm just a greedy capitalist pig. OINK!