Adobe Ae: Animating Vertical Text

So I created a vertical text box and inserted text. 

I clicked the Animate triangle button next to the text layer and clicked on Offset. 

Time: 00:00:00, Offset: 0%, Opacity: 0% > then I set a key frame.

Then I moved to 00:20:00, Offset: 100%, Opacity: 0% > then I set another key frame. 

So when I hit preview, my text is appearing from right to left. 

I need it to appear from left to right. Any sugguestions?