However, it ranks behind over 60 countries (out of around 180) in per capita economic output, making it an upper-middle income country. Additionally, its development is highly uneven. Its major cities and coastal areas are far more prosperous compared to rural and interior regions. China brought more people out of extreme poverty than any other country in history—between 1978 and 2018, China reduced extreme poverty by 800 million. China reduced the extreme poverty rate—per international standard, it refers to an income of less than $1.90/day—from 88% in 1981 to 1.85% by 2013. According to the World Bank, the number of Chinese in extreme poverty fell from 756 million to 25 million between 1990 and 2013. The portion of people in China living below the international poverty line of $1.90 per day (2011 PPP) fell to 0.3% in 2018 from 66.3% in 1990. Using the lower-middle income poverty line of $3.20 per day, the portion fell to 2.9% in 2018 from 90.0% in 1990. Using the upper-middle income poverty line of $5.50 per day, the portion fell to 17.0% from 98.3% in 1990.