In turn, the Libyans' standard of life greatly improved over the first decade of Gaddafi's administration, and by 1979 the average per-capita income was at $8,170, up from $40 in 1951;
In 1979, how much did the average per capita income change for Libyans?
by 1979 the average per-capita income was at $8,170, up from $40 in 1951