Room rates at some Trump-branded hotels have dropped since the week of President Trump’s inauguration in January 2017. (Charles Rex Arbogast/AP)

A year after President Trump entered the White House, the effect of his presidency on his company is still largely undetermined.

His downtown Washington hotel seems to be doing well. In Toronto and New York's SoHo neighborhood, meanwhile, Trump's brand became so polarizing that it was dropped.

Now, new data suggests that rates at some Trump hotels have not fared well during the Trump administration.

British travel data firm FairFX checked room rates at every Trump hotel or resort property for a two-day period the week of Trump's inauguration in 2017, then did the same for a comparable two-day period a year later.

It found that rates for the most expensive rooms were down at nine Trump properties compared with a year ago. For the least expensive rooms, rates were down at seven of the nine properties, with prices at two golf resorts — in Doonbeg, Ireland, and Turnberry, Scotland — holding steady.

Those figures do not include Trump hotels in the District and Vancouver, B.C., where rates could not be fairly compared. Trump International Hotel & Tower Vancouver had not officially opened when Trump became president, and rates at Trump International Hotel are predictably down because the inauguration is the biggest event for any Washington-area hotel every four years.

In addition, the analysis, based on a weekend stay, has a small sample size — a snapshot that could be skewed, for instance, by a conference or other temporary attraction causing prices to spike.

Still, "prices for a weekend in one of his hotels have for the most part decreased," FairFX chief executive Ian Strafford-Taylor, said in a statement. And while "big events, like the inauguration in Washington, will usually cause prices to rise in that city for a particular weekend, the decreases in other places suggest that it doesn't necessarily pay to be presidential."

The Trump Organization did not respond to a request for comment.

Some of the findings are not entirely surprising, given the hotel market, even if the rate changes are dramatic.

For instance, hotel rates have plunged throughout Panama, where the most expensive rooms at the Trump International Hotel & Tower Panama, in Panama City, are down 71 percent — from $4,222 for two nights last year to $1,218 this year. The least expensive rooms are down 12 percent, from $466 to $409.

The Trump Organization also is defending its management of the Panama building with its owners, who have voted to end the company's involvement.

In Manhattan, where the hotel market has softened as well, the Trump International Hotel & Tower New York, overlooking Central Park, is also experiencing rate drops. Last January, a two-night stay at the most expensive room there cost $3,738. Now, the rate is $2,842. The least expensive room rate dropped from $1,362 to $776.

Trump still benefits financially from his properties but has put the company in the hands of his adult sons, Donald Trump Jr. and Eric Trump.