Got it, i can see what i was doing wrong. Thanks guy!

I changed months to array of numbers (1,2,3,4,...) which resulted to this:

screenshot.6719.jpg

It seems the number is quite low for that sharp increase in traffic e.g. from 25 visits to 1000 (in month 5) the slope is 0.34%.

I want to get the IF statement working now for this figure, any suggestions on how to go about this?

Cheers.