What was the change in the basic Weighted average shares used in computing net income (loss) per share from 2018 to 2019?
{"Numerator: -- Net income (loss)": {"2019": 20732.0, "2018": -26743.0, "2017": 18072.0}, "Net income (loss) per share: -- Basic": {"2019": 0.25, "2018": -0.34, "2017": 0.24}, "Net income (loss) per share: -- Diluted": {"2019": 0.25, "2018": -0.34, "2017": 0.24}, "Weighted average shares used in computing net income (loss) per share: -- Basic": {"2019": 81447998.0, "2018": 77709592.0, "2017": 73994577.0}, "Weighted average shares used in computing net income (loss) per share: -- Weighted average effect of diluted stock options": {"2019": 229035.0, "2018": "\u2014", "2017": 544520.0}, "Weighted average shares used in computing net income (loss) per share: -- Weighted average effect of diluted stock awards": {"2019": 1004181.0, "2018": "\u2014", "2017": 789246.0}, "Weighted average shares used in computing net income (loss) per share: -- Diluted": {"2019": 82681214.0, "2018": 77709592.0, "2017": 75328343.0}}
basic_weighted_average_shares_used_in_computing_net_income_loss_per_share_2019 = df["Weighted average shares used in computing net income (loss) per share: -- Basic"]["2019"]
basic_weighted_average_shares_used_in_computing_net_income_loss_per_share_2018 = df["Weighted average shares used in computing net income (loss) per share: -- Basic"]["2018"]
answer = basic_weighted_average_shares_used_in_computing_net_income_loss_per_share_2019 - basic_weighted_average_shares_used_in_computing_net_income_loss_per_share_2018