Earnings per share (EPS) Growth Rate ratio, which are an important measure of an O&G company’s success over time, is expressed as a percentage and it shows the relative growth of EPS over the last two reporting periods. A minus sign indicates negative growth from last year. If the previous year’s EPS-basic is zero earnings per share growth rate is not defined. The formula is the following: = [(current year’s EPS-basic – previous year’s EPS-basic) / Absolute Value(previous year’s EPS-basic)] * 100