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WASHINGTON — If you want to go to your happy place, you need more than cash. A winter coat helps — and a sense of community.

A new report shows Norway is the happiest country on Earth, Americans are getting sadder, and it takes more than just money to be happy.

Norway vaulted to the top slot in the World Happiness Report despite the plummeting price of oil, a key part of its economy. Income in the United States has gone up over the past decade, but happiness is declining.

The United States was 14th in the latest ranking, down from No. 13 last year, and over the years Americans steadily have been rating themselves less happy.

"It's the human things that matter. If the riches make it harder to have frequent and trustworthy relationship between people, is it worth it?" asked John Helliwell, the lead author of the report and an economist at the University of British Columbia in Canada (ranked No. 7). "The material can stand in the way of the human."

Studying happiness may seem frivolous, but serious academics have long been calling for more testing about people's emotional well-being, especially in the United States. In 2013, the National Academy of Sciences issued a report recommending that federal statistics and surveys, which normally deal with income, spending, health and housing, include a few extra questions on happiness because it would lead to better policy that affects people's lives.

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Related: Why Is the 'World's Best Democracy' So Much Better Than U.S.?

Norway moved from No. 4 to the top spot in the report's rankings, which combine economic, health and polling data compiled by economists that are averaged over three years from 2014 to 2016. Norway edged past previous champ Denmark, which fell to second. Iceland, Switzerland and Finland round out the top 5.

"Good for them. I don't think Denmark has a monopoly on happiness," said Meik Wiking, chief executive officer of the Happiness Research Institute in Copenhagen, who wasn't part of the global scientific study that came out with the rankings.

"What works in the Nordic countries is a sense of community and understanding in the common good," Wiking said.

The Northern Lights are seen over the village of Mestervik, Norway. YANNIS BEHRAKIS / Reuters, file

Still, you have to have some money to be happy, which is why most of the bottom countries are in desperate poverty. But at a certain point extra money doesn't buy extra happiness, Helliwell and others said.

Central African Republic fell to last on the happiness list, and is joined at the bottom by Burundi, Tanzania, Syria and Rwanda.

Germany was ranked 16, followed by the United Kingdom (19) and France (31).

The report ranks 155 countries. The economists have been ranking countries since 2012, but the data used goes back farther so the economists can judge trends.

Related: These Are the Happiest and Healthiest Places in the U.S.

The rankings are based on gross domestic product per person, healthy life expectancy with four factors from global surveys. In those surveys, people give scores from 1 to 10 on how much social support they feel they have if something goes wrong, their freedom to make their own life choices, their sense of how corrupt their society is and how generous they are.

While most countries were either getting happier or at least treading water, America's happiness score dropped 5 percent over the past decade. Venezuela and the Central African Republic slipped the most over the past decade. Nicaragua and Latvia increased the most.

A man walks with a child near the marina in Bergen, Norway. STOYAN NENOV / Reuters, file

Study co-author and economist Jeffrey Sachs of Columbia University said in a phone interview from Oslo that the sense of community, so strong in Norway, is deteriorating in the United States.

"We're becoming more and more mean spirited. And our government is becoming more and more corrupt. And inequality is rising," Sachs told The Associated Press, citing research and analysis he conducted on America's declining happiness for the report. "It's a long-term trend and conditions are getting worse."

He predicted that economic measures that the administration of President Donald Trump is trying to pursue would make things worse.

"They are all aimed at increasing inequality — tax cuts at the top, throwing people off the health care rolls, cutting Meals on Wheels in order to raise military spending. I think everything that has been proposed goes in the wrong direction," Sachs said in an interview with Reuters.