Beginning May 3, 2021 the weeklySummary dataset will only contain data for the latest rolling 12 months.
As previously announced: Historical datasets have been introduced to segment prior year data from current year data where it makes sense. The first historical dataset is the weekly summary historical dataset (weeklySummaryHistoric). Beginning May 3, 2021 the weeklySummary production dataset will only contain data for the latest rolling 12 months. The weeklySummary historical dataset will contain a rolling 4 years of data and is designed for one-time downloads of historic data, while the production dataset is designed for ongoing updates to the weekly summary data.