Through the introduction of more than 150 temperate and semi-temperate zone crops, the Royal Project has brought hill-tribe farmers an average income that compares well with, and in many cases exceeds, the average for the north of Thailand. The average income per family is currently 64,000 Baht per year, whereas typical incomes at the time of inception of the Royal Project would have been around 4000 Baht for opium growing families, and less for subsistence-farming dominated families.