What is the total net earnings attributable to common shareholders - basic in 2018 and 2019?
{"Net earnings attributable to common shareholders  basic": {"2019": 3040.0, "2018": 2785.0}, "Dividends declared per common share (in dollars)": {"2019": 3.17, "2018": 3.02}, "Weighted average number of common shares outstanding (in millions) -- Weighted average number of common shares outstanding  basic": {"2019": 900.8, "2018": 898.6}, "Weighted average number of common shares outstanding (in millions) -- Assumed exercise of stock options(1)": {"2019": 0.6, "2018": 0.3}, "Weighted average number of common shares outstanding (in millions) -- Weighted average number of common shares outstanding  diluted (in millions)": {"2019": 901.4, "2018": 898.9}}
net_earnings_2019 = df["Net earnings attributable to common shareholders  basic"]["2019"]
net_earnings_2018 = df["Net earnings attributable to common shareholders  basic"]["2018"]
answer = net_earnings_2019 + net_earnings_2018