The table below shows the approximate value of Canada's crude oil and natural gas exports over a 5-year period.The amounts shown are billions of dollars. 
TABLE 2-7 Refer to Table 2-7.Assume that 2013 is the base year,with an index number = 100.What is the percentage change in the value of exports of natural gas from 2016 to 2017?
Definitions:
Lexicon
A vocabulary of a language, person, or branch of knowledge, including words and expressions as well as their meanings.
Concepts
Mental representations of categories of objects, events, or ideas based on shared properties.
Categorization
The process of recognizing, differentiating, and understanding objects, concepts, or experiences by grouping them into categories based on shared characteristics.
Superordinate
A term used to describe a higher level or more general category under which lower level categories or entities are grouped.
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