What is the company's total revenue from continuing operations in 2018 and 2017?
{"Net sales: -- United States": {"2019": 901.3, "2018": 854.6, "2017": 759.4}, "Net sales: -- Canada": {"2019": 45.6, "2018": 42.3, "2017": 32.4}, "Net sales: -- Consolidated": {"2019": 946.9, "2018": 896.9, "2017": 791.8}}
total_revenue_2017 = df["Net sales: -- Consolidated"]["2017"]
total_revenue_2018 = df["Net sales: -- Consolidated"]["2018"]
answer = total_revenue_2017 + total_revenue_2018