Easier than I though, 13~ on 1st attempt, 97 on second (after reading few comments). I just tried to stack everything, when it was cheap and to make 30-50 crates deals (mainly during middle stage of game). I also had useful excess of tea, which helped me over 3 years. My mistake was spending 12,5k on fees, instead giving boats. I couldn't do anything in last year (very high prices) and ended up with 0 opium and 120 tea (lose). Still... badge.