The following table shows average prices per barrel of crude oil: 
Excluding 1970, in what year was crude oil least expensive (adjusted for inflation) ? Use the following inflation table.
Definitions:
Slave Revolt
An armed uprising by enslaved people seeking freedom from servitude, notably seen in instances such as the Haitian Revolution or Nat Turner's rebellion.
1822
A specific year in the 19th century marked by various global historical events, lacking a singular defining characteristic without context.
1815
is the year marked by the end of the Napoleonic Wars with the defeat of Napoleon at the Battle of Waterloo.
Colonization Movement
An initiative mainly in the 18th and 19th centuries aimed at resettling freed African Americans in Africa, notably in Liberia.
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