In the company charts it is possible to select “cum” which means “cumulative”. In this case the level at each year is the sum of the levels for all the previous years. For example, if earnings per share for four years were: 10, 15, 20, 25, then the “cum” chart would show 10, 25, 45, 70. (This is because 10 + 15 = 25, 10 + 15 + 20 = 45, and 10 + 15 + 20 + 25 = 70.)

So what the chart is showing is the cumulative earning per share each year.

The “norm” selection is different. It shows the percentage above and below the average level. For example, suppose the PE ratios over 4 years were 12, 16, 14, 18. The average is 15. Since 12 is 80% of 15, 16 is 106.7% of 15, 14 is 93.3% of 15, and 18 is 120% of 15. Hence values of the “norm” chart would be 80%, 106.7%, 93.3%, 120%...