[Patgaepx]

My boss, coworkers, and myself are puzzled about this. I have to compare sales for 2 types of products over a specific time period. The problem is that these products are scattered throughout these years. Some existed only 2-3 years in the middle of the required time frame (others in the beginning or end). Others existed for much longer. Year to year sales differences are also great. Usually sales per year increase with years, but some increases are huge (from 30 million to 700 million in just one year). So, how could I fairly compare sales from these 2 types of products.