Contribute additional evidence

Do you know additional data points or key sources of evidence?
Just fill the form below, we will review it promptly and upload it on the website.
The title of the dataset or chart suggested.
The original URL of the source.
The name of the source.
Data you should add (structured formats are preferred, like CSV, XLS, JSON or XML).
Are these contents compatible with CC-BY 4.0 license?