The scatter plot file of country-level data has been prepared for Excel so that the equation (and the statistical significance, R-squared) should be displayed on the graph that Excel creates. Because of scaling, however, the box with equation and significance may be placed outside the field of vision. To force Excel to replace it properly, reformat the plot selecting the option of NOT displaying the equation and then reformat it again to display the equation. See the Help file of Excel for more extensive detail on all aspects of graphics with Excel.