Typical rate of accumulation of sediments on the deep-ocean floor range around in 1000 years. answer 0.5-1 cm 2-5 cm 10-40 cm 2-4 m 12 m

In the middle of the ocean the sedimentation rate is as slow as 0.5 - 1 cm because the sediments are only from the wind, that was blown. then in continental margins, sedimentation rate is very fast at about 2-4 m per 1000 yr. so in deep ocean, sedimentation rate is about 2 - 5 cm per 1000 years.

Considering only personal water use, people in the developed world use about  germany was the only country in world war 1 to use u-boats  than people in the developing world