By 1950 it had decreased to less than 800, having halved within 2 decades.
The population had therefore halved within 2 decades. By 1950 it had decreased to under 800 people.
By 1950 it had decreased to under 800 people. The population had therefore halved within 2 decades.
By 1950 it had decreased to under 800 people. The population had therefore halved within 2 decades.