Using the data in the following tables, Let matrix A represent imports (in billions of dollars) to U.S. from country groupings, and let matrix B represent exports (in billions of dollars) from U.S. to country groupings. Find the U.S. trade balance with each country grouping in each year by finding matrix B - A. 
Definitions:
Atomic Mass
Average of atom mass units for all the isotopes of an atom.
Ionic Compound
A chemical compound composed of ions held together by ionic bonds, typically formed between metal and non-metal elements.
Calcium Chloride
A chemical compound used in various applications, including as a de-icing agent, in food preservation, and in laboratory settings to provide a source of calcium ions.
Extra Electrons
Additional electrons that surpass the baseline number expected in an atom or molecule, often leading to negative charge and chemical reactivity.
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