Percent

In September 2009, the 456 came to Earth and demanded ten percent of the children of humanity. (TV: Children of Earth: Day Three)

Ellen Hunt claimed that the Spanish flu of 1918 killed "something like" five percent of the human race. (TV: Children of Earth: Day Four)

According to the Fifth Doctor, the Earth's Sun was made up of seventy-four percent hydrogen and twenty-four percent helium. (AUDIO: Feast of Fear)

The Ninth Doctor told Charles Dickens that he was "one hundred percent brilliant". (TV: The Unquiet Dead)

The Master assured Lucy Saxon that the sonic wave of his Archangel Network was 100% effective at influencing human minds. However, it became apparent that some, such as Vivien Rook, were not convinced, leading the Master to amend his claim to "99, 98...". (PROSE: Speech Day, TV: The Sound of Drums)

Miss Foster promoted the Adipose pill as "one hundred percent legal, one hundred percent effective." (TV: Partners in Crime)

A Vault Dalek reported that the Crucible was at 90% efficiency as the 21st century Dalek invasion commenced. (TV: The Stolen Earth)