What did the Embargo Act do to American exports within a single year?

1. British and French blockades left no American craft free to trade without threat of seizure. 2. Jefferson persuaded Congress to pass an Embargo Act forbidding foreign commerce. 3. Shipping interests were almost ruined and discontent rose in New England and New York. 4. Farmers suffered too, since prices dropped when their surplus could not be shipped. 5. In a single year American exports fell to one-fifth of their former volume. 6. The hope that the embargo would starve Britain into a change of policy failed. 7. A milder non-intercourse law was substituted, permitting trade with all countries except Britain and France. _Source: An Outline of American History (U.S. Information Agency, 1990, public domain), section SECOND WAR WITH ENGLAND_