Consider the following data:

Year	Birth Rate	Death rate
1911–1921	48.1	35.5
1921–1931	46.4	36.3
1931–1941	45.2	31.2
1941–1951	39.9	27.4
1951–1961	41.7	22.8
1961–1971	41.1	18.9
1971–1981	37.1	14.8

For which period was the natural growth rate maximum?

The correct option is 1971 – 1981.

Step-by-Step Explanation:

1. Definition of Natural Growth Rate:

The natural growth rate of a population is calculated by subtracting the death rate from the birth rate for a given period:

$\text{Natural Growth Rate}=\text{Birth Rate}-\text{Death Rate}$

2. Calculate the Natural Growth Rate for Each Period:

Let us calculate the natural growth rate for all the periods listed in the provided data table:

• For 1911–1921:

$48.1-35.5=12.6$

• For 1921–1931:

$46.4-36.3=10.1$

• For 1931–1941:

$45.2-31.2=14.0$

• For 1941–1951:

$39.9-27.4=12.5$

• For 1951–1961:

$41.7-22.8=18.9$

• For 1961–1971:

$41.1-18.9=22.2$

• For 1971–1981:

$37.1-14.8=22.3$

3. Conclusion:

Comparing all the calculated natural growth rates, the maximum value is 22.3, which corresponds to the period 1971 – 1981.