pre_text: H. Net Income Per Share Basic net income per share is computed by dividing net income by the weighted-average number of common stock outstanding during the period. Diluted net income per share is computed by dividing net income by the weighted-average number of common stock outstanding and potentially dilutive securities outstanding during the period, as calculated using the treasury stock method. Potentially dilutive securities primarily include unvested restricted stock units (“RSUs”), including PSU awards, and stock options, including purchase options under VMware’s employee stock purchase plan, which included Pivotal’s employee stock purchase plan through the date of acquisition. Securities are excluded from the computation of diluted net income per share if their effect would be anti-dilutive. VMware uses the two-class method to calculate net income per share as both classes share the same rights in dividends; therefore, basic and diluted earnings per share are the same for both classes. The following table sets forth the computations of basic and diluted net income per share during the periods presented (table in millions, except per share amounts and shares in thousands):
table: For the Year Ended
table: January 31, 2020 February 1, 2019 February 2, 2018
table: Net income attributable to VMware, Inc. $6,412 $1,650 $437
table: Weighted-average shares, basic for Classes A and B 417,058 413,769 410,315
table: Effect of other dilutive securities 8,177 7,362 10,572
table: Weighted-average shares, diluted for Classes A and B 425,235 421,131 420,887
table: Net income per weighted-average share attributable to VMware, Inc. common stockholders, basic for Classes A and B $15.37 $3.99 $1.07
table: Net income per weighted-average share attributable to VMware, Inc. common stockholders, diluted for Classes A and B $15.08 $3.92 $1.04
question: Analyse this data from a financial earnings document. What was the change in the Effect of other dilutive securities between 2018 and 2019?