original_query: What are the values of the first set of numbers?
query: What are the values in the first numerical data set in the article?
answer: The first numerical data set in the article shows Abacha's administration increased foreign exchange reserves from $494 million in 1993 to $9.6 billion by mid-1997, and reduced Nigeria's external debt from $36 billion in 1993 to $27 billion by 1997.