What is the proportion of deposits revenue over total revenue in 2017?
{"Major product category -- Deposits software and hardware": {"2019": 41860, "2018": 33071, "2017": 25407}, "Major product category -- Deposits service and other": {"2019": 15170, "2018": 8437, "2017": 6963}, "Major product category -- Deposits revenue": {"2019": 57030, "2018": 41508, "2017": 32370}, "Major product category -- Identity verification software and hardware": {"2019": 4985, "2018": 7627, "2017": 4240}, "Major product category -- Identity verification service and other": {"2019": 22575, "2018": 14424, "2017": 8780}, "Major product category -- Identity verification revenue": {"2019": 27560, "2018": 22051, "2017": 13020}, "Major product category -- Total revenue": {"2019": 84590, "2018": 63559, "2017": 45390}}
deposits_revenue_2017 = df["Major product category -- Deposits revenue"]["2017"]
total_revenue_2017 = df["Major product category -- Total revenue"]["2017"]
answer = deposits_revenue_2017 / total_revenue_2017