one solution might be:
tabInput: LOAD Date, Reading, (Reading-Previous(Reading))/(Date-Previous(Date))*365 as Annual FROM [http://community.qlik.com/servlet/JiveServlet/download/582931-118876/ID%20277046.xlsx] (ooxml, embedded labels, table is Sheet1);
the reason for the slightly different results between your excel calculation and previously suggested QV solutions might be that your original post just included dates while your excel source contains timestamps with different times than 00:00:00.
hope this helps
QlikCommunity_Thread_128402.qvw 155.2 K