Step 1 :The equation for the least squares line is given as \(Y=85.49X+2052.46\).
Step 2 :The slope of the least squares line represents the average increase in consumer credit per year.
Step 3 :The slope of the line is given as 85.49, which means that on average, consumer credit is increasing by \$85.49 billion per year.
Step 4 :So, the final answer is \(\boxed{85.49}\).