At an ice cream shop, three flavors are increasing in demand. last year, banana, pumpkin and rocky road ice cream made up 12% of the ice cream sales. this year, the same three ice creams made up 16.9% of ice cream sales. the rocky road doubled, the banana sales increases by 50%, and the pumpkin sakes increased by 20%. if the rocky road ice cream had one less percent than the banana ice cream, find the percentage of ice cream sales each individual ice cream made last year.