pre_text: Plans with projected benefit obligations in excess of plan assets are attributable to unfunded domestic supplemental retirement plans, and our U.K. retirement plan. Accrued benefit liability reported as: As of September 30, 2019 and 2018, the amounts included in accumulated other comprehensive income, consisted of
  deferred net losses totaling approximately $6.3 million and $5.3 million, respectively. The amount of net deferred loss expected to be recognized as a component of net periodic benefit cost for the year ending September 30, 2019, is approximately $229 thousand.
table: September 30,
table: 2019 2018
table: (Amounts in thousands)
table: Current accrued benefit liability $335 $340
table: Non-current accrued benefit liability 6,904 6,168
table: Total accrued benefit liability $7,239 $6,508
question: Analyse this data from a financial earnings document. What is the change in non-current accrued benefit liability between 2018 and 2019?