In July 2008, the daily production rate fell sharply by 36% to from a year earlier. Analysts theorize that this rapid decline is a result of production enhancement techniques causing faster short-term oil extraction at the expense of field longevity. By January 2009, oil production at Cantarell had fallen to , a drop in production of 38% for the year, resulting in a drop in total Mexican oil production of 9.2%, the fifth year in a row of declining Mexican production.