SAN JUAN, Puerto Rico — Rob Rex, a 32-year-old graphic designer, is among the more than 1,000 Puerto Ricans leaving the island each week, according the American Community Survey. Most of them are heading to the mainland, and many go to central Florida, particularly Orlando.

“The reality of leaving Puerto Rico in three weeks has set in. As has some depression,” said Rex in a July 8 Facebook post. Rex, whose last name has been changed because of security considerations at the aerospace company where he works, landed in Tampa on Tuesday.

“I was one of the people that was very critical a few years back of those who left, saying, ‘You’re a traitor,’” he said before leaving, speaking on the phone from his home in Aguadilla on the island’s northwest coast. “And now I’m the one being called a sellout — ‘You’re abandoning Puerto Rico.’ I tell them, ‘I’m not abandoning Puerto Rico, Puerto Rico abandoned me.’”

The island’s economy has shrunk for nearly a decade. According to a former staffer at the International Monetary Fund, that’s a remarkable feat for “an economy suffering neither civil strife nor overt financial crisis.”

Unemployment is high — 12.6 percent in June (compared with 5.3 percent on the U.S. mainland) and that’s down from a high of nearly 17 percent in 2010, according to figures from the Bureau of Labor Statistics. Economists say a more telling statistic is that only 40 percent of adults are employed or looking for work, with the rest economically idle or working in the informal economy.

With jobs so scarce, it’s little surprise that the island is bleeding residents — about 50,000 per year, according to an August 2014 report from the Pew Research Center using American Community Survey data.

“Puerto Ricans have left the financially troubled island for the U.S. mainland this decade in their largest numbers since the Great Migration after World War II, citing job-related reasons above all others,” the report states.

The report adds that Puerto Rico is experiencing the first sustained population decline in its history as a U.S. territory, while the number of Puerto Ricans in the 50 states continues to grow briskly. Puerto Ricans account for 9 percent of the U.S. Hispanic population, second only to Mexican-Americans, who represent 65 percent.

In 2006, for the first time, there were more Puerto Ricans living on the U.S. mainland than on the island. The margin has grown since. As of 2012, there were approximately 4.9 million Puerto Ricans stateside and 3.5 million on the island.

According to CIA World Factbook estimates for 2014, Puerto Rico ranked seventh, just ahead of Ukraine, for population loss. (Syria is No. 1.)

Rex said he thinks outmigration will only increase in the coming years, and he’s trying to beat what he sees as an imminent flood.

“I think it’s a trickle compared to what’s going to happen,” he said.

Rex said he resisted the mainland for as long as he could. He moved from San Juan, the capital, to Aguadilla a few years ago, accepting a job with an aerospace company in order to stay in Puerto Rico. He said his job paid well and he received annual raises. But they didn’t keep up with the rising cost of living.

“When I first started, I had money left over at the end of month, and now I’m just barely breaking even,” he said.

By January, he decided to leave. After interviewing for positions in Miami, Atlanta and California, he accepted a job in Tampa. But he felt wistful about his looming departure.

“I’m scared for Puerto Rico. I feel really sad for whoever stays behind because they’re going to shoulder the burden,” he said.