Schedule VI W. R. Berkley Corporation and Subsidiaries Supplementary Information Concerning Property-Casualty Insurance Operations Years Ended December 31, 2020, 2019 and 2018 124 See Report of Independent Registered Public Accounting Firm. (In thousands) 2020 2019 2018 Deferred policy acquisition costs $ 556,168  $ 517,364  $ 497,629  Reserves for losses and loss expenses 13,784,430  12,583,249  11,966,448  Unearned premiums 4,073,191  3,656,507  3,359,991  Net premiums earned 6,930,843  6,633,288  6,371,505  Net investment income 583,821  645,614  674,235  Losses and loss expenses incurred: Current year 4,432,937  4,057,989  3,926,489  Prior years 627  34,079  6,831  Loss reserve discount accretion 35,142  39,048  41,382  Amortization of deferred policy acquisition costs 904,955  1,001,611  915,246  Paid losses and loss expenses 3,598,649  3,659,402  3,664,885  Net premiums written 7,262,437  6,863,499  6,433,227  ___________________