What is the average Research and development funding?
{"Research and development funding": {"Year ended December 31, 2019": 132, "Year ended December 31, 2018": 52, "Year ended December 31, 2017": 65}, "Phase-out and start-up costs": {"Year ended December 31, 2019": -38, "Year ended December 31, 2018": -1, "Year ended December 31, 2017": -8}, "Exchange gain (loss), net": {"Year ended December 31, 2019": "\u2014", "Year ended December 31, 2018": 4, "Year ended December 31, 2017": 4}, "Patent costs": {"Year ended December 31, 2019": -1, "Year ended December 31, 2018": -8, "Year ended December 31, 2017": -9}, "Gain on sale of businesses and non-current assets": {"Year ended December 31, 2019": 7, "Year ended December 31, 2018": 8, "Year ended December 31, 2017": 4}, "Other, net": {"Year ended December 31, 2019": 3, "Year ended December 31, 2018": -2, "Year ended December 31, 2017": -1}, "Total": {"Year ended December 31, 2019": 103, "Year ended December 31, 2018": 53, "Year ended December 31, 2017": 55}}
rd_funding_2019 = df["Research and development funding"]["Year ended December 31, 2019"]
rd_funding_2018 = df["Research and development funding"]["Year ended December 31, 2018"]
rd_funding_2017 = df["Research and development funding"]["Year ended December 31, 2017"]
other_net_2019 = df["Other, net"]["Year ended December 31, 2019"]
answer = (rd_funding_2019 + rd_funding_2018 + rd_funding_2017) / other_net_2019