 According to an analysis of the most recently available census data, Mexican immigrants have the highest rate of employment among the city's 10 largest immigrant groups, and they are more likely to hold jobs than New York City's native-born population.Based on the 2008 census data, about 75 percent of all Mexicans in the city between ages 16 and 65 are in the civilian labor force and only around four percent of them are unemployed, which is well below the nation's current unemployment rate of 9.6%.Experts say the main reason so many of these illegal aliens are employed is because they are undocumented, and, consequently, they are less likely to report workplace abuses to the authorities for fear of deportation.