The Maastricht Treaty EMU convergence criterion series for long-term interest rates are shown here. Selection guidelines require data to be based on central government bond yields on the secondary market, gross of tax, with a residual maturity of around 10 years. The bond or the bonds of the basket have to be replaced regularly to avoid any maturity drift.
The legal basis is the Article 121 of the Treaty establishing the European Community and Protocol on the convergence criteria.
Daily and monthly convergence series data are collected by the European Central Bank (ECB) from the national central banks.
For more information on some national series click here:
footnotes for Maastricht series. See also:
Statistics in focus Long-term interest rates for Acceding countries.