<P> The IMF uses a flexible classification system that considers "(1) per capita income level, (2) export diversification--so oil exporters that have high per capita GDP would not make the advanced classification because around 70% of its exports are oil, and (3) degree of integration into the global financial system ." </P> <P> The World Bank classifies countries into four income groups . These are set each year on July 1 . Economies were divided according to 2016 GNI per capita using the following ranges of income: </P> <Ul> <Li> Low income countries had GNI per capita of US $1,025 or less . </Li> <Li> Lower middle income countries had GNI per capita between US $1,026 and US $4,035 . </Li> <Li> Upper middle income countries had GNI per capita between US $4,036 and US $12,236 . </Li> <Li> High income countries had GNI per capita above US $12,237 . </Li> </Ul> <Li> Low income countries had GNI per capita of US $1,025 or less . </Li>

What does the un use to classify a nation developed or developing