International inbound travel has been on the decline for the past three months, according to the U.S. Travel Association’s Travel Trends Index, and the trend is likely to continue this year.

U.S. Travel attributed the decline to the strength of the U.S. dollar, which is particularly weighing on travel from Canada.

The latest index does not include data following Britain’s vote to leave the European Union. That data will begin to appear in August’s index, which includes data from June.

“It will be interesting to see how global events, such as Britain’s recent vote to leave the European Union, affect these trends in the months ahead,” said David Huether, U.S. Travel's vice president for research.

Despite a decline in international travel and a decline in domestic business travel, U.S. Travel's Current Travel Index showed growth for May 2016 because of the strength of the domestic leisure market.

In fact, the Current Travel Index has shown growth for the past 77 months, as the industry continues a 6-year expansion that is expected to continue through the end of the year.

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