What is the percentage change in the weighted average number of common shares outstanding from 2018 to 2019?
{"": {"Years ended December 31,": 2019.0, "": 2018.0}, "BASIC AND DILUTED -- Weighted average number of common shares outstanding": {"Years ended December 31,": 8844.0, "": 5884.0}, "BASIC AND DILUTED -- Net loss attributable to Neonode Inc.": {"Years ended December 31,": -5298.0, "": -3060.0}, "BASIC AND DILUTED -- Net loss per share basic and diluted": {"Years ended December 31,": -0.6, "": -0.52}}
weighted_average_2019 = df["BASIC AND DILUTED -- Weighted average number of common shares outstanding"]["Years ended December 31,"]
weighted_average_2018 = df["BASIC AND DILUTED -- Weighted average number of common shares outstanding"][""]
answer = (weighted_average_2019 - weighted_average_2018) / weighted_average_2018 * 100.0