What was the percentage increase in gross profit from 2018 to 2019?
{"": {"2019": "", "2018": "(Unaudited)", "2017": ""}, "Gross profit": {"2019": 2283.9, "2018": 1753.2, "2017": 1689.1}, "Non-GAAP gross profit": {"2019": 2317.0, "2018": 1785.5, "2017": 1743.2}, "Gross margin": {"2019": 89, "2018": 85, "2017": 83}, "Non-GAAP gross margin": {"2019": 90, "2018": 87, "2017": 86}, "Loss from operations": {"2019": -25.0, "2018": -509.1, "2017": -499.6}, "Non-GAAP income (loss) from operations": {"2019": 316.0, "2018": -112.0, "2017": -125.5}, "Operating margin": {"2019": -1, "2018": -25, "2017": -25}, "Non-GAAP operating margin": {"2019": 12, "2018": -5, "2017": -6}, "Net loss": {"2019": -80.8, "2018": -566.9, "2017": -582.1}, "Non-GAAP net income (loss)": {"2019": 223.3, "2018": -106.3, "2017": -111.0}, "Diluted net loss per share": {"2019": -0.37, "2018": -2.58, "2017": -2.61}, "Non-GAAP diluted net income (loss) per share": {"2019": 1.01, "2018": -0.48, "2017": -0.5}, "GAAP diluted weighted average shares used in per share calculation": {"2019": 218.9, "2018": 219.5, "2017": 222.7}, "Non-GAAP diluted weighted average shares used in per share calculation": {"2019": 222.0, "2018": 219.5, "2017": 222.7}}
gross_profit_2019 = df["Gross profit"]["2019"]
gross_profit_2018 = df["Gross profit"]["2018"]
answer = (gross_profit_2019 - gross_profit_2018) / gross_profit_2018 * 100.0