What is the percentage change in total Research and development expenses?
{"Research and development expenses": {"2018": 125280, "2019": 150745}, "Capitalization of development expenses": {"2018": -49688, "2019": -60202}, "Amortization of capitalized development expenses": {"2018": 12039, "2019": 15597}, "Research and development grants and credits": {"2018": -321, "2019": -49}, "Total research and development expenses": {"2018": 87310, "2019": 106091}, "Impairment of research and development related assets": {"2018": 1278, "2019": 4755}, "Total": {"2018": 88588, "2019": 110846}}
total_2019 = df["Total"]["2019"]
total_2018 = df["Total"]["2018"]
answer = ( total_2019 - total_2018 ) / total_2018 * 100.0