Lost Data

Data loss isn't typically clean cut at a year boundary, whether it is a Numbers document or anything else, unless perhaps if it was the last/previous time it was saved (or thought to have been saved). Does your table have a filter on it that is hiding rows for the current year? Or maybe they got hidden by accident? Or maybe you opened a backup copy from last year, not your most recent version?

Can you give more specific? What entries? In what document?

SG