What was the increase / (decrease) in Canadian broadband services from 2018 to 2019?
{"(in thousands of dollars, except percentages)": {"2019 (1)": "$", "2018 (2)": "$", "Change": "%", "Change in constant currency (3)": "%", "Foreign exchange impact (3)": "$"}, "Canadian broadband services": {"2019 (1)": 688681.0, "2018 (2)": 681020.0, "Change": 1.1, "Change in constant currency (3)": 1.3, "Foreign exchange impact (3)": -1102.0}, "American broadband services": {"2019 (1)": 465645.0, "2018 (2)": 369200.0, "Change": 26.1, "Change in constant currency (3)": 21.5, "Foreign exchange impact (3)": 16911.0}, "Inter-segment eliminations and other": {"2019 (1)": -46386.0, "2018 (2)": -43402.0, "Change": 6.9, "Change in constant currency (3)": 6.8, "Foreign exchange impact (3)": -12.0}, "": {"2019 (1)": 1107940.0, "2018 (2)": 1006818.0, "Change": 10.0, "Change in constant currency (3)": 8.5, "Foreign exchange impact (3)": 15797.0}}
canada_broadband_2019 = df["Canadian broadband services"]["2019 (1)"]
canada_broadband_2018 = df["Canadian broadband services"]["2018 (2)"]
answer = canada_broadband_2019 - canada_broadband_2018