What was the increase / (decrease) in the total revenues from 2018 to 2019?
{"Total revenues": {"2019": 349640, "2018": 346251, "2017": 350611}, "Income from operations": {"2019": 100182, "2018": 100571, "2017": 104973}, "Net income before taxes": {"2019": 99146, "2018": 99408, "2017": 103497}, "Net income": {"2019": 99146, "2018": 99408, "2017": 103497}, "Current assets": {"2019": 80655, "2018": 75040, "2017": 78782}, "Non-current assets": {"2019": 156672, "2018": 103996, "2017": 95959}, "Current liabilities": {"2019": 33292, "2018": 24719, "2017": 22472}, "Non-current liabilities": {"2019": 92477, "2018": 51840, "2017": 51463}, "Partnership equity": {"2019": 111558, "2018": 102478, "2017": 100806}}
total_revenues_2019 = df["Total revenues"]["2019"]
total_revenues_2018 = df["Total revenues"]["2018"]
answer = total_revenues_2019 - total_revenues_2018