With an estimate of 11.3 million undocumented immigrants in the U.S. in 2014, the size of this population has remained stable for the last five years, according to an analysis of the Census Bureau’s data released Wednesday by Pew Research Center.

“The overall estimate has fluctuated little in recent years because the number of new unauthorized immigrants is roughly equal to the number who are deported, leave the U.S. on their own, convert to legal status, or (in a small number of cases) die,” reads the report. 

However, the share of undocumented immigrant adults who have lived in the nation for a decade or more has nearly doubled, from 35 percent in 2000 to 62 percent in 2012.

Additionally, the share of undocumented-immigrant adults who lived with their U.S.-born children grew from 2.1 million or 30 percent in 2000 to 4 million or 38 percent.

Since 2009, there has been an average of about 350,000 new undocumented immigrants each year.