Bulgaria had a government debt-to-GDP ratio of 21.2% at the end of the first quarter of 2019, the second lowest in the European Union, after Estonia, the bloc's statistical office Eurostat said.Romania's debt-to-GDP ratio of 34.1% was the sixth lowest among 28 EU member states at the end of March, Eurostat said in a statement on Friday. Among EU-28 Greece posted the highest government debt-to-GDP ratio of 181.9%.On a quarterly comparison basis, Slovenia and Bulgaria were among the EU member states with the highest decreases in their debt-to-GDP ratios, by 2.3 and 1.4 percentage points, respectively.