On January 4, 1956 the price of a stembolt was $68.37. On January 4, 1974 the price of a stembolt was $52.10. Find the average rate of change in the price of a stembolt from 1956 to 1974. Round to the nearest cent.

The average rate of change is $LaTeX: \displaystyle \frac{52.10-68.37}{1974-1956}= -0.90$ dollars per year.