For that indicator, The World Bank provides data for Libya from 1991 to 2018. The average value for Libya during that period was 18.73 percent with a minumum of 16.09 percent in 2015 and a maximum of 21.14 percent in 1999.
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The unemployment rate in Libya and other countries is defined as the number of unemployed people as percent of the labor force. The labor force includes the people who are either employed or unemployed, i.e. who don't have a job but are actively looking for one. The labor force does not include people who are not looking for work, children, and the retired.
The unemployment rate seldom declines below 4-5 percent even during boom times. There are always people who move between different sectors of the economy or between cities. When the economy goes into recession, then unemployment can reach much higher numbers, sometimes even in the double digits.
Definition: Unemployment refers to the share of the labor force that is without work but available for and seeking employment.