Big Brother continued its daily decline on Friday night – the fourth day running that Nine’s reality show has dropped audience.

It averaged a metro audience of 833,000 according to preliminary overnight metro ratings from OzTam. This was just half of its Monday night launch show.

While the show was expected to see a fall off after its heavily promoted debut on Monday, the constant decline since then raises the stakes for the coming week – when weekday-to-weekday comparisons can be made.

Monday will almost certainly be down on the previous Monday because that was the debut show, but after that the market will begin to get a fuller picture on where Big Brother’s audience is likely to settle.

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Big Brother’s first week: