text: On 1 August 2009 , Net Applications began weighting its raw data based on the number of internet users in the countries concerned , using data from the CIA ; the changes were applied retroactively to older data .
simplified: On 2009-08-01 , Net Applications began weighting its raw data based on the number of internet users in the countries concerned , using data from the CIA ; the changes were applied retroactively to older data .