pre_text: UK SIP The weighted average market value per ordinary share for SIP awards released in 2019 was 386.1p (2018: 372.0p). The SIP shares outstanding at 31 March 2018 have fully vested (2018: had a weighted average remaining vesting period of 0.1 years). Shares released prior to the vesting date relate to those attributable to good leavers as defined by the scheme rules.
table: 2019 2018
table: Number Number
table: Outstanding at 1 April 690,791 776,045
table: Dividend shares awarded 4,518 9,778
table: Forfeited (9,275) (75,986)
table: Released (365,162) (19,046)
table: Outstanding at 31 March 320,872 690,791
table: Vested and outstanding at 31 March 320,872 –
question: Analyse this data from a financial earnings document. What was the change in the amount Outstanding at 31 March in 2019 from 2018?