What is the percentage change in revenues from 2018 to 2019?
{"Year Ended December 31, -- ": {"2019": 2019, "2018": 2018}, "(In thousands) -- Revenues": {"2019": 36898, "2018": 36149}, "(In thousands) -- Income from operations": {"2019": 4461, "2018": 4973}, "(In thousands) -- Income from operations as a % of revenues": {"2019": 12, "2018": 14}}
revenue_2019 = df["(In thousands) -- Revenues"]["2019"]
revenue_2018 = df["(In thousands) -- Revenues"]["2018"]
answer = (revenue_2019 - revenue_2018) / revenue_2018 * 100.0