What was the percentage change in total software development costs between 2018 and 2019?
{"Internally-developed software costs": {"2019": 345, "2018": 291}, "Payments made to third-party software developers": {"2019": 31, "2018": 38}, "Total software development costs": {"2019": 376, "2018": 329}}
total_software_development_costs_2019 = df["Total software development costs"]["2019"]
total_software_development_costs_2018 = df["Total software development costs"]["2018"]
answer = ( total_software_development_costs_2019 - total_software_development_costs_2018 ) / total_software_development_costs_2018 * 100.0