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)": 606286.0, "2018 (2)": 618886.0, "Change": -2.0, "Change in constant currency (3)": -2.2, "Foreign exchange impact (3)": 1102.0}, "American broadband services": {"2019 (1)": 571208.0, "2018 (2)": 478172.0, "Change": 19.5, "Change in constant currency (3)": 15.2, "Foreign exchange impact (3)": 20522.0}, "Inter-segment eliminations and other": {"2019 (1)": 26486.0, "2018 (2)": 24567.0, "Change": 7.8, "Change in constant currency (3)": 7.8, "Foreign exchange impact (3)": 12.0}, "": {"2019 (1)": 1203980.0, "2018 (2)": 1121625.0, "Change": 7.3, "Change in constant currency (3)": 5.4, "Foreign exchange impact (3)": 21636.0}}
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