What was the increase / (decrease) in the Dividends on multiple voting shares from 2018 to 2019?
{"(In thousands of Canadian dollars)": {"2019": "$", "2018": "$"}, "Dividends on multiple voting shares": {"2019": 32951, "2018": 29813}, "Dividends on subordinate voting shares": {"2019": 70757, "2018": 63886}, "": {"2019": 103708, "2018": 93699}}
dividends_on_multiple_voting_shares_2019 = df["Dividends on multiple voting shares"]["2019"]
dividends_on_multiple_voting_shares_2018 = df["Dividends on multiple voting shares"]["2018"]
answer = dividends_on_multiple_voting_shares_2019 - dividends_on_multiple_voting_shares_2018