She cautions that it is impossible to tell how much of the decrease is due to slowing immigration and how much may be attributable to other causes, such as more immigrants obtaining permanent status and qualifying for regular licenses or lingering fear by some that signing up for cards could lead to deportation.
But since numbers continue to drop, that at least suggests immigration is not increasing, she said.
"It's just further evidence that when the Great Recession hit, migration came to a virtual standstill here and nationally," Perlich said, adding that "we've had such an anemic recovery" that immigration has not revived.
"We have seen a few families that have gone back home" because of a continuing slow economy, said Luis Garza, executive director of Communidades Unidas. "Mainly, those [undocumented immigrants] who are here have been here for a few years," and he sees few new immigrants.
"There's definitely more stability with less immigration now," said Michael Clara, a Salt Lake City School Board member who works with the undocumented community.
The Utah driving privilege card was enacted in 2005 as a way for undocumented immigrants to drive legally and obtain auto insurance. At the time, many immigrants feared registering for the cards could lead to deportation, even though the law banned the program from sharing personal information with immigration officials.
In the first year, about 25,000 cards were issued, and that climbed to nearly 34,000 in the second year.
"I cannot think of one [undocumented] person I know who doesn't have a driving privilege card" by now, said Clara. "Everybody recognizes that you are far better off having it than not."
Mark Alvarez, an attorney and activist in the Latino community, said most undocumented immigrants have become convinced that it is wiser to have cards than "to risk being arrested for driving without a license or not having insurance."
While state officials worked hard to advertise them and promise they would not lead to deportation, in the beginning, Alvarez said those efforts naturally dropped off over time — with the effect that he thinks some immigrants may not seek them now for lingering fear over deportation.
Alvarez and Garza add that cost may be a barrier for a few immigrants to obtain the cards.
The cards cost the same as regular driver licenses ($25 for an adult, $30 for people under age 21) but are good for only one year, instead of the 5-year period of a regular driver license — essentially costing five times as much.
Also, first-time driving privilege card applicants must pay $55 for a background check and fingerprinting.