What was the percentage change in granted stocks in 2019 from 2018?
{"Restricted Stock Units: -- Non-vested at January 1": {"2019": 2454, "2018": 3174, "2017": 3778}, "Restricted Stock Units: -- Awarded": {"2019": 1139, "2018": 790, "2017": 939}, "Restricted Stock Units: -- Vested": {"2019": -1237, "2018": -1382, "2017": -1434}, "Restricted Stock Units: -- Forfeited": {"2019": -87, "2018": -128, "2017": -109}, "Restricted Stock Units: -- Non-vested at December31": {"2019": 2269, "2018": 2454, "2017": 3174}, "Stock Options: -- Outstanding at January 1": {"2019": 506, "2018": 531, "2017": 926}, "Stock Options: -- Granted": {"2019": 102, "2018": 69, "2017": 111}, "Stock Options: -- Exercised": {"2019": -280, "2018": -94, "2017": -501}, "Stock Options: -- Forfeited": {"2019": -7, "2018": "\u2014", "2017": "\u2014"}, "Stock Options: -- Expired": {"2019": -2, "2018": "\u2014", "2017": -5}, "Stock Options: -- Outstanding at December 31": {"2019": 319, "2018": 506, "2017": 531}, "Stock Options: -- Vested and expected to vest at December 31": {"2019": 319, "2018": 506, "2017": 531}, "Stock Options: -- Exercisable at December 31": {"2019": 85, "2018": 256, "2017": 233}}
granted_2019 = df["Stock Options: -- Granted"]["2019"]
granted_2018 = df["Stock Options: -- Granted"]["2018"]
answer = ( granted_2019 - granted_2018 ) / granted_2018 * 100.0