How common are 'go arounds'?

[Turbodiesel1690]

Was landing at Frankfurt on a Lufthansa flight a few months ago in fog, when we were quite close to the ground engines throttled up to what seemed like full throttle and we back up we went, a fairly unnerving experience. Made worse when the captain comes on the intercom and said they were unable to see the runway and we'd circle for an 'automatic landing'. Everything was OK of course but just wondering if any of those in the industry could advise how common an occurence this is? I've flown a heck of alot in the past 4 years but only one of these so far, cheers