America's retailers enjoyed a record 2011 and their first $400 billion sales months ever. But the final month of the year was a dud.

Sales eked out a 0.1 percent increase in December, lifting sales to a seasonally adjusted $400.6 billion.

It was the second straight month that sales have topped $400 billion. The government revised November sales to show a 0.4 percent gain, twice the original estimate.

For all of 2011, sales totaled a record $4.7 trillion. That was a gain of nearly 8 percent over 2010 — the largest percentage increase since 1999.

Steady sales gains have fueled a 20 percent surge from the low during the Great Recession. Monthly sales are even 6 percent above their pre-recession high. The figures confirm evidence that the economy was strengthening as 2011 ended.

Still, December's increase was the weakest in seven months. Excluding volatile auto purchases, overall sales actually fell 0.2 percent. It was the first such drop since May 2010.

Part of the reason was lower gasoline prices. Those prices reduced sales at gasoline stations by 1.6 percent. Excluding gas stations, overall retail sales would have risen 0.3 percent in December.

Another factor was heavy discounting during the holiday shopping season. Many retailers said they had to offer cut prices in December to attract shoppers.

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