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Euro bond rates are below 0 nominal for maturities up to 15 years:

I don't have data on the quantities of these bonds outstanding, but trillions is almost certain.

There are many other bonds that are still above 0 yield nominal, but which are below 0 real yield due to inflation.

Barclays Global Agg bond index includes $13T USD of negative yield bonds. And Swiss bonds have negative yields out to 50 years.