EOC 38 - Q24 - Continuing RI per share

Why is Residual Income per share being calculated as EPS - (r*Bt-1) for years 2012-2014 but then is calculated as [ROE*Bt-1] - [r*Bt-1] in 2015? I don’t understand why they don’t calculate 2015 RI per share the same as 2012-2014

Because EPS for 2015 isn’t given but is for the previous years.