I have to find some data of Germany, Greece 10 years bonds and risk premium from 2017 up to now. I found some sources,
but there exist some differences between them. For example, in the first site, the yield on 05/09/2019 was given -0.04%. In Bloomberg, it was given -0.05%. Which one is trustworthy? Does anyone know the reason for which this difference arises? Is there any other source that I can check?