pre_text: N. NET INCOME PER COMMON SHARE The following table sets forth the computation of basic and diluted net income per common share: (1) Incremental shares from the assumed conversion of the convertible notes was calculated using the difference between the average Teradyne stock price for the period and the conversion price of $31.62, multiplied by 14.5 million shares. The result of this calculation, representing the total intrinsic value of the convertible debt, was divided by the average Teradyne stock price for the period. (2) Convertible notes hedge warrant shares were calculated using the difference between the average Teradyne stock price for the period and the warrant price of $39.68, multiplied by 14.5 million shares. The result of this calculation, representing the total intrinsic value of the warrant, was divided by the average Teradyne stock price for the period. The computation of diluted net income per common share for 2018 excludes the effect of the potential exercise of stock options to purchase approximately 0.1 million shares and restricted stock units to purchase approximately 0.5 million shares because the effect would have been anti-dilutive. The computation of diluted net income per common share for 2017 excludes the effect of the potential exercise of stock options to purchase approximately 0.1 million shares because the effect would have been antidilutive.
table: 2019 2018 2017
table: (in thousands, except per share amounts)
table: Net income for basic and diluted net income per share $467,468 $451,779 $257,692
table: Weighted average common shares-basic 170,425 187,672 198,069
table: Effect of dilutive potential common shares:
table: Incremental shares from assumed conversion of convertible notes (1) 4,909 2,749 1,298
table: Convertible note hedge warrant shares (2) 2,698 485 112
table: Restricted stock units 1,236 1,385 1,800
table: Stock options 178 278 335
table: Employee stock purchase rights 13 36 27
table: Dilutive potential common shares 9,034 4,933 3,572
table: Weighted average common shares-diluted 179,459 192,605 201,641
table: Net income per common share-basic $2.74 $2.41 $1.30
table: Net income per common share-diluted $2.60 $2.35 $1.28
question: Analyse this data from a financial earnings document. What was the change in Net income per common share-diluted in 2019 from 2018?