Peru Economy By Erobertson1 Period: 1830 to 1870 Quano Age 1858 80% of government income from guano Period: 1890 to 1930 Expansion Period: 1890 to 1927 Series of economic booms from export products 1928 30% of exports are oil 1929 Cotton was 18% of exports 1933 Decline in growth from Great Depression Period: 1945 to 1967 Growth from end of WWII Opening of international markets Period: 1970 to 1990 Coca leaf most profitable export crop 1985 Top 20% received 51% of income, lowest 20% got 5% of income