Fifteen percent of adults in the United States do not use the Internet, according to a new Pew Research Center survey.

This is a 33 percent drop from 15 years ago when Pew Research first began surveys on the topic.

An equal percentage of adult men and women do not use the Internet, but the statistics show differences between races. Asian-Americans are the most likely to use the Internet, and only 5 percent are offline. But for blacks, that number jumps to 20 percent, while 14 percent of whites and 18 percent of Hispanic-Americans are offline.

The percentages also differ among age groups. Only 3 percent of adults ages 18-29 are offline, but 39 percent of adults 65 and older refuse to surf the net. Only 3 percent of those making over $75,000 a year do not use the Internet while one out of four people making under $30,000 do not use the web.

People without a high school diploma were more than eight times more likely to refrain from Internet use than those with a college degree.

The survey also noted that Americans living in urban environments were equally as likely to not use the web as their suburban counterparts at 13 percent each. Meanwhile, 24 percent of Americans living in rural areas reported not using the Internet.

A 2013 Pew Research Survey revealed that 34 percent of those not online said they had no interest in the web, or felt it was irrelevant to their lives. Nearly a third, 32 percent, said the Internet was too difficult to use. Another 19 percent said computers and Internet providers were too expensive.

The survey was conducted from March 17-April 12, May 28-31 and again June 10-July 12, and included only English-speaking Asians.