Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
10^(3.109106 * ln((number of weeks since 2009 Jan 09)/weeks) - 8.164198)
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
