Selecting a dataset will allow you to choose the regions and time periods for which the data is available.
For each selection, click "Add Selection to Datasheet". Click "View Datasheet" for a web-based view of the data and for a spreadsheet download option.
Some American Community Survey estimates characterize multiple years. Data sourced as ACS 5-year, for example, are for the 5-year time period ending in the displayed year.