What was the percentage change in total restructuring charges between 2018 and 2019?
{"Severance and related charges": {"2019": 3041, "2018": 4239, "Cumulative Cost Through December 31, 2019": 7280}, "Facility relocation and closure charges": {"2019": 1996, "2018": "\u2014", "Cumulative Cost Through December 31, 2019": 1996}, "Total restructuring charges": {"2019": 5038, "2018": 4239, "Cumulative Cost Through December 31, 2019": 9277}}
total_restructuring_charges_2019 = df["Total restructuring charges"]["2019"]
total_restructuring_charges_2018 = df["Severance and related charges"]["2018"]
answer = (total_restructuring_charges_2019 - total_restructuring_charges_2018) / total_restructuring_charges_2018 * 100.0