What was the percentage change in the total anti-dilutive securities between 2019 and 2020?
{"Anti-dilutive securities: -- Employee stock options": {"January 31, 2020": 34, "February 1, 2019": 50, "February 2, 2018": 51}, "Anti-dilutive securities: -- Restricted stock units": {"January 31, 2020": 315, "February 1, 2019": 255, "February 2, 2018": 140}, "Anti-dilutive securities: -- Total": {"January 31, 2020": 349, "February 1, 2019": 305, "February 2, 2018": 191}}
total_antidilutive_securities_2020 = df["Anti-dilutive securities: -- Total"]["January 31, 2020"]
total_antidilutive_securities_2019 = df["Anti-dilutive securities: -- Total"]["February 1, 2019"]
answer = ( total_antidilutive_securities_2020 - total_antidilutive_securities_2019 ) / total_antidilutive_securities_2019 * 100.0