The number of deaths per 1,000 people during a given period is called -
Mortality rate
Mortality rate is correct.
The mortality rate, also called the crude death rate, is the number of deaths per 1,000 people in a given period, usually one year.
It is calculated as \(\dfrac{D}{P}\times 1000\), where D is the number of deaths in the year and P is the mid-year population.
Infant mortality counts deaths of children below one year per 1,000 live births, the maternal mortality rate counts maternal deaths per 100,000 live births, and the birth rate counts live births per 1,000 people.
Resources that get exhausted after years of use are called: