What was the percentage change in the Total stock-based compensation expense between 2017 and 2018?
{"Sales and marketing": {"2019": 2075, "2018": 1196, "2017": 561}, "General and administrative": {"2019": 6474, "2018": 4901, "2017": 2638}, "Research and development": {"2019": 12054, "2018": 7332, "2017": 4214}, "Total stock-based compensation expense": {"2019": 20603, "2018": 13429, "2017": 7413}}
total_stockbased_compensation_expense_2018 = df["Total stock-based compensation expense"]["2018"]
total_stockbased_compensation_expense_2017 = df["Total stock-based compensation expense"]["2017"]
answer = (total_stockbased_compensation_expense_2018 - total_stockbased_compensation_expense_2017) / total_stockbased_compensation_expense_2017 * 100.0