Poor, sorry Britain.
That percentage reflects the number of babies aborted (at least 187,499) in Britain & Wales in 2005.
British women had 645,835 live births last year - amounting to a 1.8 Total Fertility Rate per woman (TFR). Basic demographics state that for a nation's population to grow, the TFR needs to be 2.1.
When you add the number of abortions, the TFR was actually 2.3 children per woman. But abortion is kinking the hose of British population growth. Except for the Muslims.
I sure hope the Superman wasn't among those aborted.