The countries' total government debt relative to their annual economic output was barely changed at 90 per cent of gross domestic product in the third quarter of 2012 compared with 89.9 per cent for three months earlier, the EU's statistics office Eurostat reported. It was up from 86.8 per cent of GDP a year earlier.
"The cause behind the slight increase is no longer a growing debt pile, but a shrinking gross domestic product," said Ulrich Kater, an economist with Germany's DekaBank.
"It is positive news that the trend of increasing debt, which began with the financial crisis five years ago, has been stopped," he added.
But shrinking economies make it difficult for eurozone countries to get debt levels under control despite pushing through harsh spending cuts and reforms because shrinking output makes the value of a country's debt as a proportion of the size of its economy worse.
The International Monetary Fund, meanwhile, downgraded its growth forecast for the eurozone Wednesday from 0.1 per cent to a minus 0.2 per cent contraction, warning that the eurozone "continues to pose a large downside risk to the global outlook."
Given the bleak economic outlook, "one has to be prepared that the debt level in the eurozone will rise further," said analyst Christoph Weil of Germany's Commerzbank.
More than three years after Europe's debt crisis started in Greece, the eurozone only registers very meagre growth, with seven member countries still in recession —Spain, Italy, Greece, Cyprus, Portugal, Slovenia, and Finland — according to Eurostat.
Government debt across the entire 27-nation EU totalled 85.1 per cent at the end of September, compared with 85 per cent in June, according to Eurostat. The European debt levels compare to about 110 per cent in the United States, 88 per cent in Canada, or 240 per cent in Japan, according to IMF data.
"Compared to the U.S. or Japan, Europe's average debt level looks excellent," Weil said. "But the eurozone is not one entity guaranteeing all of its member states' debt. The problem is the unequal distribution, with some countries like Greece or Portugal having an unsustainably high debt burden," he added.
The highest increases of the quarterly debt level were indeed recorded in the countries worst-hit by the crisis: Ireland's rose by 5.9 percentage points to 117 per cent, in Portugal it was up by 3 percentage points to 120 per cent. Greece, which is in sixth year of a severe recession, recorded an increase of 3.4 percentage points to 153 per cent, the eurozone's highest debt ratio.
"Once growth returns the eurozone's debt ratio will decrease, although we don't expect that to happen before 2015-2016," Kater said.
Echoing the trend of stabilization in Europe's debt levels, rating agency Fitch revised its outlook on Belgium from negative to stable Wednesday, citing the government's success in trimming its budget deficit as planned.
Belgium's public debt level has now peaked at about 100 per cent and will start dwindling to 79 per cent by 2021, the agency added.
Germany has been the main reason why the eurozone as a whole has not fallen into recession — technically defined as two quarters of negative growth in a row — but Europe's biggest economy is showing signs of slowing down as the debt crisis takes its toll on the country's exports.
Its economy shrank slightly in the final quarter of 2012 and the government this month lowered this year's growth forecast to a meagre 0.4 per cent.
Geir Moulson contributed to this story.
Juergen Baetz can be reached on Twitter at http://www.twitter.com/jbaetz