Donald Trump’s border wall could end up keeping more Mexicans in than out. A new Pew Research Study suggests that more Mexicans have left the U.S. than those who’ve entered since the end of the global economic recession in 2009.

The study, which analyzes government and census data from both Mexico and the U.S., says the decline in northbound emigrant traffic could be due to several factors, including a slow economic recovery in the U.S., stricter enforcement at the U.S.-Mexico border, deportations, and Mexicans’ desire to reunite with their families back home.

The latter reason may be the strongest, the report found. A 2014 survey by Mexico’s National Institute for Statistics and Geography (INEGI) found that 61% of Mexicans returning home from the U.S. cited family reunification as their main motivation.

Some Mexicans are also changing the way they view the U.S.

According to the report, a growing number of Mexicans believe life in the U.S. is not much better than it is in Mexico.

“While almost half (48%) of adults in Mexico believe life is better in the U.S., a growing share says it is neither better nor worse than life in Mexico,” the report reads. “Today, a third (33%) of adults in Mexico say those who move to the U.S. lead a life that is equivalent to that in Mexico.”

The new findings could also change the conversation in the United States, where immigration discourse focuses disproportionately on Mexicans. In reality, the numbers tell a different story.

The U.S. Census Bureau reported than in 2013 China surpassed Mexico as the top origin country for new immigrant arrivals. The American Community Survey reported 147,000 newly arrived Chinese immigrants in 2013, compared to 129,000 Indians and 125,000 Mexicans.

“Regardless of the exact number of new immigrants from each country arriving in the U.S. each year, the trends are clear: over the past decade, immigration from China and India to the U.S. has increased steadily, while immigration from Mexico has declined sharply,” states the Pew report.

Pew adds that the number of unauthorized Mexican immigrants in the U.S. has also continued to decrease since reaching a peak of 6.9 million in 2007. By 2014, the number of undocumented Mexicans in the U.S. dipped to 5.6 million —a decrease that Pew attributes to increased deportations, tighter border enforcement and fewer Mexicans attempting to cross.

You can read the full Pew report here.