Tourists shoot pictures outside the Cathedral, in Old Havana, Cuba, May 24, 2015. [Photo/IC]

HAVANA - The thaw in relations between the US and Cuba has led to a stunning 36 percent increase in visits by Americans to the island, including thousands who are flying into Cuba from third countries like Mexico in order to sidestep US restrictions on tourism.

The dramatic rise was seen in the number of Americans with no family ties to Cuba who visited between Jan 1 and May 9 of this year compared to the same period in 2014, according to statistics provided to The Associated Press by a University of Havana professor.

In addition to the boom in American visitors, Cuba has seen a 14 percent jump in arrivals from around the world between January and early May compared to the same period last year.

From Jan 1 to May 9, 51,458 Americans visited Cuba, compared to 37,459 over that period last year, according to new statistics provided exclusively to The Associated Press by Jose Luis Perello Cabrera, an economist in the University of Havana's tourism studies department with access to official figures. The figures also included revealing details on the thousands of Americans who are entering Cuba through third countries, many to sidestep US restrictions on tourism.

There were 38,476 visitors who flew directly from the US to Cuba, compared to 29,213 in the same period last year.

Another 12,982 Americans came in via third countries, a whopping 57 percent increase over the 8,246 Americans who flew to Cuba from elsewhere in the same period last year.

Mexico, the Bahamas, Jamaica and the Cayman Islands are the top choices for Americans entering Cuba from non-US points, Perello said.

Cuba also has seen a 14 percent rise in overall tourism. Arrivals from 206 counties from Jan. 1 to May 9 rose from 1,349,903 last year to 1,547,104 this year. Visitors from Germany were up 22 percent; France, 25 percent; the United Kingdom, 26 percent and Spain 16 percent.