What was the average total revenue between 2018 and 2019?
{"Software Solutions": {"2019": 1012.3, "2018": 962.0, "$": 50.3, "%": 5.0}, "Data and Analytics": {"2019": 165.4, "2018": 154.5, "$": 10.9, "%": 7.0}, "Corporate and Other (1)": {"2019": -0.5, "2018": -2.5, "$": 2.0, "%": "NM"}, "Total": {"2019": 1177.2, "2018": 1114.0, "$": 63.2, "%": 6.0}}
total_2019 = df["Total"]["2019"]
total_2018 = df["Total"]["2018"]
corporate_and_other_1_dollars = df["Corporate and Other (1)"]["$"]
answer = ( total_2019 + total_2018 ) / corporate_and_other_1_dollars