The 7 must-know numbers of the week

The rate at which the population of Mandurah, Western Australia, is growing, according to ABS figures. The town, 72 kilometres from Perth, is also among the 20 worst-performing suburbs for mortgage delinquencies, according to Fitch Ratings. 

The discount at which the top property on SQM Research director Louis Christopher's top 10 most discounted property list is marked down. The property, at 1/35 Northcliffe Terrace in Surfers Paradise, Queensland, was bought for $4.4 million in 2007 and was initially put up for sale with an asking price of $4.95 million in December 2009. The asking price now is $2.9 million.

The time on Property Observer's Property Clock for the Perth units market. The market is nearing the bottom, meaning prices will likely start rising again in the near future and it is a good time to buy. Capital values of Perth units fell -2.9% in April, according to RP Data.

The size of Nicole Kidman and Keith Urban's Sutton Forest, NSW, property, which is within a 115-square-kilometre land area being explored by Cockatoo Coal. Cockatoo is digging two exploratory bore holes on the perimeter of Kidman's property. Landholders in the area are concerned about noise, pollution, safety and declining property values if the company decides to mine the area.

The amount paid for the second apartment sold in the luxury The Cove Clovelly development, which has been on the market since February. The three-bedroom unit was sold to a local owner-occupier, and the agents say they have an undisclosed offer on a penthouse in the building.

The number of Melbourne viewers who tuned into the first episode of The Block, whose contestants will renovate four rundown cottages in the Melbourne suburb of Richmond. Melbourne viewership for the show's first episode far exceeded Sydney's 365,000.

Australia's ranking on the Knight Frank Global House Price Index Report. Australia is among the 25 countries with flat or negative house price growth, and was ranked seventh just six months ago.