The time series line chart below shows the prices of a volatile stock from January 1999 to December 1999. Between which two consecutive months did the price of the stock drop by The greatest percentage? 
Definitions:
Electrolyte studies
Tests that measure the levels of key electrolytes in the body such as sodium, potassium, and chloride, which are critical for maintaining proper body function.
Coagulation studies
Tests that measure the ability of blood to clot properly, essential for diagnosing and treating blood disorders or monitoring anticoagulant therapy.
Hematology studies
The branch of medicine concerned with the study of blood, blood-forming organs, and blood diseases.
Phlebotomy procedure
A medical procedure that involves making an incision in a vein to draw blood for testing, transfusions, or treatment for certain medical conditions.
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