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