We'll use 1969 and 1970 as years 1 and 2 respectively. Also, say we're looking at Revenue growth or loss.

Example 1 Year 1 Revenue 1000 Year 2 Revenue 250

Step 1. 250 - 1000 = -750 Step 2. -750/1000 = - .75 Step 3. Convert to % = - 75% (Negative = LOSS %)

Example 2 Year 1 Revenue 150 Year 2 Revenue 500

Step 1. 500 - 150 = 350 Step 2. 350/150 = 2.33 Step 3. Convert to % = 233% (Positive = GROWTH %)