Pension Benefits Other Post-retirement Benefits Year Ended December 31 2020 2019 2020 2019 Change in Benefit Obligation Benefit obligation at beginning of year $ (18,107) $ (15,720) $ (1,027) $ (935) Service cost (115) (111) (10) (8) Interest cost (491) (600) (27) (35) Amendments 37  (3) 2  (8) Actuarial loss (1,780) (2,446) (60) (101) Settlement/curtailment/other (65) (33) (4) (4) Benefits paid 829  806  64  64  Benefit obligation at end of year $ (19,692) $ (18,107) $ (1,062) $ (1,027) Change in Plan/Trust Assets Fair value of assets at beginning of year $ 13,177  $ 11,532  $ 644  $ 570  Actual return on plan assets 1,843  2,206  102  117  Employer contributions 480  185  —  2  Settlement/curtailment/other 58  39  —  —  Benefits paid (807) (785) (41) (45) Fair value of assets at end of year $ 14,751  $ 13,177  $ 705  $ 644  Funded status at end of year $ (4,941) $ (4,930) $ (357) $ (383) Pension Benefits Other Post-retirement Benefits December 31 2020 2019 2020 2019 Net actuarial loss (gain) $ 5,752  $ 5,276  $ (12) $ (9) Prior service (credit) cost (93) (73) 12  12  Total amount recognized in AOCL, pretax $ 5,659  $ 5,203  $ —  $ 3  Pension Benefits Other Post-retirement Benefits December 31 2020 2019 2020 2019 Noncurrent assets $ 69  $ 61  $ 121  $ 94  Current liabilities (181) (166) (125) (130) Noncurrent liabilities (4,829) (4,825) (353) (347) Net liability recognized $ (4,941) $ (4,930) $ (357) $ (383) Amounts deferred in AOCL for our defined benefit plans consisted of the following: Amounts recognized on the Consolidated Balance Sheet consisted of the following: The overall increase in our pension benefit obligation for the year ended December 31, 2020, was due primarily to actuarial losses created by the change in the weighted-average discount rate, which decreased from 3.19% at December 31, 2019, to 2.54% at December 31, 2020. The overall increase in our pension benefit obligation for the year ended December 31, 2019, was due primarily to actuarial losses created by the change in the weighted-average discount rate, which decreased from 4.28% at December 31, 2018, to 3.19% at December 31, 2019. 89