A How General Are These Findings? A.1 The effect of outdated models persists beyond the 2018/2019 test period. Following 2.2, we derive different A.2 The effect of outdated models persists beyond the two-year gap. For this experiment, we keep the same 2018-2019 test set introduced in 2.2, and train models with We test whether the temporal degradation trend is a generalizable pattern that holds across languages. In practice, our implementation of dynamic evaluation differs from Eq. 2 in two ways: (i) We perform The x-axis presents the years in a reverse chronological order.

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