display the content of a text file using a formatted table,
Display the percentage change for all fields in a formatted table (the percentage change is calculated based on data read from the text file),
Search for a specific field. If the field is found, display the number of degrees in 1981 and 2011 in a text box. If the field is not found, display a message saying that field is not found,
Quit the program (Quit button), and
(Optional, 15 Extra Credit) Show a histogram of the number of degrees in 2011
(Hint: use a loop to display the number of stars in the histogram. Refer to Ch6 Exercise 1). For every 10000 degrees, display one star.
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