pre_text: The following table summarizes information regarding shares of common stock granted and vested (in thousands, except per common stock amounts): As of December 31, 2019, there was $0.2 million of total unrecognized compensation cost, net of actual forfeitures, related to nonvested common stock. This cost is expected to be recognized over a weighted average period of 4.2 years.
table: Years Ended December 31,
table: 2019 2018 2017
table: Number of shares of common stock granted 16 16 13
table: Weighted average grant-date fair value per common stock $29.10 $28.48 $30.49
table: Fair value of common stock vested $320 $315 $334
table: Cash used to settle the obligation $366 $804 $1,134
question: Analyse this data from a financial earnings document. What was the change in Fair value of common stock vested in 2019 from 2018?