A lot of reports suggest that you use the figures reported by the Google Keyword Planner.

The figures it presents are better than nothing but you definitely shouldn't think that they're anything close to being accurate.

The main purpose of the keyword planner is to sell AdWords adverts.

The fact that marketers can use it to get a glimpse of possible search volume is a side effect that Google have to live with: they can't give potential advertisers figures without...