Data confidence level:
Cities with a high number of carparks (relative to the number of workers) are said to increase overall car dependence, and dissuade commuters from opting for public transport. For this reason, the increase of available parking spaces is not increasing proportionately with demand, as city councils are trying to actively limit their availability. It also explains the increase in prices of undercover car parking in Australia's capitals.
This FACT indicates the projected number of CBD carparks per 1,000 workers in 2013, (that is, spaces within carpark buildings designed for that purpose) in each Australian capital city. This is according to the 2012 Colliers International, Australian CBD Car Park White Paper.