The euro zone economy started the year with robust growth that outstripped that of the US and set the stage for a strong 2017, preliminary estimates showed today. 

The improving economy may weaken the eurosceptic parties that have gained ground in several European Union states over the past years.

Many of these have denounced the poor state of their economies and have called for ditching the euro and returning to national currencies. 

The gross domestic product of the euro zone grew by 0.5% on the quarter in the first quarter, which translates to annualised growth of 1.8% in all of 2017, the European statistics agency Eurostat said. 

The preliminary euro zone figure is much higher than the 0.7% annualised growth recorded in the US in the same quarter, the weakest performance since the first quarter of 2014, according to US estimates. 

The weaker performance of the US economy was a blow for the administration of Donald Trump, who has promised strong growth with a protectionist agenda. 

The contrasting data from the US and the euro zone may weaken the French presidential candidate Marine Le Pen, who is calling for tariff barriers to protect the French economy. 

She faces free-trade supporter Emmanuel Macron in a May 7 runoff, which polls show Macron is likely to win. 

In a further sign of a healthier recovery of the euro zone, Eurostat raised to 0.5% from 0.4% its figures on growth in the fourth quarter of 2016. 

The year-on-year estimate for the last quarter was also revised up, to 1.8% from the previous 1.7%. 

Political risks, however, still represent a possible drag on euro zone growth. 

Eurosceptic parties are also on the rise in Italy, the euro zone's third-largest economy, which may hold general elections in the coming months. No date is set, but they would come no later than next May. 

Eurostat did not break down the components of the GDP growth, but economists expected it was led mostly by domestic consumption and business investment. 

Weaker domestic demand might reduce the pace of the expansion in the coming quarters as consumer prices rise. 

First estimates released in April show inflation in the 19-country currency bloc was 1.9% year-on-year in April, up from 1.5% in March and just short of the four-year high of 2% recorded in February. 

But euro zone inflation figures continue to fluctuate. Data on industrial producer prices, also released by Eurostat today, showed a marked slowdown in March. 

Producer prices fell 0.3% in March and year-on-year growth slowed to 3.9% from February's 4.5%, which was the highest in more than five years.