Which statement best describes the reasons for the increase in Canadian real GDP from 1945-2019? Multiple choice question. Between 1945 and 2019 there was an increase in the labour force as well as an increase in labour productivity. Between 1945 and 2019 there was a decrease in the labour force as well as a decrease in labour productivity. Between 1945 and 2019 there was an increase in the labour force but a decrease in labour productivity. Between 1945 and 2019 there was a decrease in the labour force but an increase in labour productivity