Consumer confidence surged to a 15-year high in December as Americans' post-election bullishness continues, according to a new report published Tuesday by The Conference Board .

The board's confidence index gained 4 percent on the month to reach its highest level since 2001 – well ahead of analysts' expectations. A sub-index tracking how consumers feel about current economic conditions declined slightly over the month, but a separate future expectations measurement surged nearly 12 percent to its highest level since 2003.

"Consumer confidence improved further in December, due solely to increasing expectations, which hit a 13-year high," Lynn Franco, the group's director of economic indicators, said in a statement Tuesday. "The post-election surge in optimism for the economy, jobs and income prospects, as well as for stock prices … was most pronounced among older consumers."

Considering President-elect Donald Trump ran away with older demographics , it's unsurprising that these people are feeling particularly chipper about the country's economic health post-election.

Indeed, consumer confidence among Trump voters and Republicans in general has surged since Election Day. A separate confidence tracker published earlier this month by Gallup showed 58 percent of Republicans thought the economy was "getting better." Prior to the election, only 15 percent thought conditions were improving.

"The recent increase in economic confidence appears mostly to be a reaction to the presidential election – chiefly among Republicans, who are much more likely to view the economy positively after Donald Trump's victory," the Gallup report said. "Republicans have shifted dramatically from a decidedly negative evaluation of the economy before the election to a positive one after it."

Trump's promises of personal and corporate tax reform, infrastructure investment, job creation and economic growth as high as 4 percent are likely fueling the run, as are the prospects of deregulation and Obamacare restructuring.

Noticing the improved confidence trackers, Trump took credit for the gains Monday on Twitter, saying that the world was a "gloomy" place before his election night victory was announced.

The world was gloomy before I won - there was no hope. Now the market is up nearly 10% and Christmas spending is over a trillion dollars! — Donald J. Trump (@realDonaldTrump) December 26, 2016



To be fair, the spending figure Trump appears to be referencing was released by Deloitte University Press in September, well before his electoral triumph was announced. Daniel Bachman, senior U.S. economist at Deloitte, indicated in that report that "attention toward presidential elections may be a temporary distraction in the early part of of the holiday shopping season" but that "it should not have a negative impact on sales, and retailers may benefit from a pickup in post-election consumer spending."

But even though Trump's win doesn't seem to be meaningfully tied to holiday shopping, it's difficult to ignore the record-setting stock rally the country has enjoyed following the election. The Dow Jones industrial average closed Friday up more than 1,600 points, or 8.7 percent, from where it closed on Nov. 8. The Standard & Poor's 500 index, likewise, was up nearly 6 percent over the same window.

Analysts have widely attributed the stock market's recent success to high expectations for the incoming administration. And these stock gains, on top of Republicans' improved expectations for the labor market and gross domestic product expansion, have been a primary driver of consumer sentiment.