TSA 2018 · Question 7 · Ratio/Proportion/Percentage
SaveBaytree Island's Council is concerned to retain a balance of skilled professional workers amongst the population, and monitors migrants in and migrants out on an annual basis. There is currently some concern about the trend, and the Chief Administration Officer was asked to prepare a statistical table for the next Council meeting, as shown below:

In which year did the island have the greatest overall loss of professionals?