What is the percentage of options granted during the year ended December 2018 as a percentage of the number of nonvested options remaining as at 31 December 2018?
{"Nonvested at December, 2017": {"Option": 1492861.0, "Weighted-Average Exercise Price": 1.54}, "Granted": {"Option": 280000.0, "Weighted-Average Exercise Price": 1.75}, "Vested": {"Option": -972651.0, "Weighted-Average Exercise Price": 1.29}, "Forfeited -- Nonvested at December, 2018": {"Option": 800210.0, "Weighted-Average Exercise Price": 1.63}, "Forfeited -- Granted": {"Option": 126567.0, "Weighted-Average Exercise Price": 1.15}, "Forfeited -- Vested": {"Option": -584895.0, "Weighted-Average Exercise Price": 1.46}, "Forfeited -- Forfeited": {"Option": -137500.0, "Weighted-Average Exercise Price": 1.75}, "Forfeited -- Nonvested at December, 2019": {"Option": 204382.0, "Weighted-Average Exercise Price": 1.74}}
granted_option = df["Granted"]["Option"]
nonvested_option = df["Forfeited -- Nonvested at December, 2018"]["Option"]
answer = granted_option / nonvested_option * 100.0