On January 4, 1961 the price of a stembolt was $50.98. On January 4, 2012 the price of a stembolt was $34.40. Find the average rate of change in the price of a stembolt from 1961 to 2012. Round to the nearest cent.

The average rate of change is $LaTeX: \displaystyle \frac{34.40-50.98}{2012-1961}= -0.33$ dollars per year.