In the first 15 years from 1851 to 1865 we had two  
massive influenza epidemics. Previous to the influenza epidemics, 
there were 6,500 Nyoongar people who were unofficially, it wasn't a census, 
but they were actually counted and recorded living  
in the south west. After the last epidemic in 1860's there were 
only 1,500 Nyoongar people left in the whole south west of Western Australia.