By citing data and statistics you acknowledge the original author/producer. You want your citation to include enough information so that a reader could find the same dataset again in the future, even if the link you provide no longer works.
The publisher may have author guidelines on how to cite data. Also, look for examples from previously published papers.
The repository or source of the dataset may have suggested citations.
If there are no recommended data citation models, try using DataCite recommendations for the minimum format for citing data:
Optional elements (as appropriate)
Recommended forms of a data citation are:
Creator (Publication Year): Title. Publisher. Identifier
Creator (Publication Year): Title. Version. Publisher. Resource Type. Identifier