"The proportion of the global population living on less than $1.90 per person per day has fallen—from 18 percent in 2008 to 11 percent in 2013, according to the

"The proportion of the global population living on less than $1.90 per person per day has fallen—from 18 percent in 2008 to 11 percent in 2013, according to the World Bank." Is this because $1.90 is 2008 money is equivalent to $2.50 now?