On January 4, 1972 the price of a stembolt was $86.97. On January 4, 1993 the price of a stembolt was $62.95. Find the average rate of change in the price of a stembolt from 1972 to 1993. Round to the nearest cent.

The average rate of change is $LaTeX: \displaystyle \frac{62.95-86.97}{1993-1972}= -1.14$ dollars per year.