There were 492 U.S. billionaires in 2014 and 261 U.S. billionaires in 2001. Find the unit ratio

Question:

There were 492 U.S. billionaires in 2014 and 261 U.S. billionaires in 2001. Find the unit ratio of the number of U.S. billionaires in 2014 to the number of U.S. billionaires in 2001. Round to the second decimal place. What does your result mean in this situation?