The information is gathered from the Bureau of Labor Statistics, C2ER, Tax-Rates.org, and Gallup-Healthways Well-Being Index.

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By contrast, more than 60% of Americans fit this description, according to a Gallup-Healthways Well-Being Index last year.

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These finding were from the January through December 2010 Gallup-Healthways Well-being Index.

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Overall, the Well-Being Index for the nation finished at 66.3%, up 0.2% from 2009 and over 2.5% higher than during the fell year of 2008.

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The charity wants to use this large-scale study to create a benchmark for a "well-being index" - so that the impact of future changes in policy can be measured.

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Santa Monica hopes to become the first American city to create a citizen well-being index, using economic vitality, social relationships, health, education and environmental factors to inform city policy decisions.

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Last November Prime Minister David Cameron launched a separate "happiness index" to measure the well-being of UK citizens.

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