Answer: They have increased, but sales have gone down because of more imposed tariffs.
Step-by-step explanation:
You included no reference passage of article to derive the information from but the above should be correct.
International trade connects buyers and sellers from across the world so if a market becomes open to international trade, the demand would increase due to people around the world now demanding the commodity. Washington State apples being introduced to the international market would increase their demand.
Supplier would respond by increasing their production and supply to match the new demand. If there are tariffs however, the price of the apples would become more expensive which would lead to sales decreasing as people don't wanna buy the apples at those higher prices.