Since the Great Recession of 2008, there have been significant shifts worldwide in the number of young adults living at home.

But in some countries, the change has been more long-lasting and severe than in others.

From 2007 to 2014, the number of youth living at home across the countries belonging to the Organization for Economic Cooperation and Development increased only slightly, by 1.2 percent, according to a report released by the organization on Wednesday. And in some nations, the percentage of youth living parents actually decreased.

Italy, Slovenia and Greece had the highest percentage of youth living at home – with more than 70 percent of 15- to 29 year-olds cohabitating with their parents. But that's not too surprising, experts say, since countries like Greece and Italy were particularly hard hit by the recession, and have a culture of young adults living longer at home.

Canada had the lowest percentage of youth living with parents – about 30 percent of the country's youth still live at home. The Nordic countries, including Denmark, Sweden, Finland and Norway, also had low numbers of young adults living at home.

France experienced the largest increase, with a 12.5 percentage point rise in the share of youth living with their parents over the seven-year time period. Report authors attribute the increase in part to the high numbers of young adults in France who are not in the workforce or in education. In France, nearly 17 percent of youth were not in a job or education institution in 2015 – an increase over the previous few years.

"We really think this is a crisis story," says Claire Keane, an economist with the OECD's social policy division. In France, she says, many benefits flow through families to reach young people. "They are relying on parents for financial support."

In the U.S, there was a 6 percent increase in the proportion of youth living with their parents from 2007 to 2014, significantly higher than the OECD average. Today, about 67 percent of 15- to 29 year-olds in the U.S. live with their parents as opposed to on their own or with a roommate, compared to around 63 percent before the crisis, according to Stéphane Carcillo, the senior economist who oversaw the report. While in the U.S. and other countries young adults under 18 are likely to live at home anyway, the report authors still consider the findings statistically significant.

The report's findings are inline with a recent Pew Research Center analysis, which found more young adults in the U.S. are living with their parents than at any time since around 1940.

The OECD report, called Society at a Glance 2016, looks at how youth across member states are faring in terms of several social indicators, such as employment, poverty, marriage and health. It found that 15 percent of youth in the OECD – about 40 million young people – were not in employment, education or training in 2015.