I have two years of excel data showing daily share prices of a particular stock. I want to change those values to show percentage change (on a daily basis) from the zero date (ie the first day of the two year period). I know that the formula for showing daily percentage change would be (second day/first day -1) and that I can click and drag on that formula to extend over the rest of the two-year data. The formula I want would be, basically, (each day/first day-1). Is there an easy way to automate the script so I dont have to type it out 730 times?