Explanation: The decadal population growth rate is a critical demographic indicator that measures the percentage increase in population over a ten-year period. In the context of Kerala, this rate is derived from the data collected during the national census conducted by the Government of India. The 2011 census, which is the most recent comprehensive census conducted in India, provides detailed information on the population dynamics of Kerala.
The decadal population growth rate for Kerala as per the 2011 census is 4.91%. This figure reflects the actual increase in population over the ten-year period leading up to the 2011 census. The calculation of the decadal growth rate involves comparing the population figures from two consecutive censuses. For Kerala, the population in 2001 was approximately 31.84 million, and in 2011, it was approximately 33.40 million. The growth rate is calculated using the formula:
\[
\text{Decadal Growth Rate} = \left( \frac{\text{Population in 2011} - \text{Population in 2001}}{\text{Population in 2001}} \right) \times 100
\]
Substituting the values:
\[
\text{Decadal Growth Rate} = \left( \frac{33.40 - 31.84}{31.84} \right) \times 100 = \left( \frac{1.56}{31.84} \right) \times 100 \approx 4.91\%
\]
This growth rate is significantly lower compared to the national average and reflects the demographic trends in Kerala, which include a high literacy rate, low fertility rate, and a high life expectancy. These factors contribute to a slower population growth rate compared to other states in India.
Understanding the decadal population growth rate is crucial for policymakers, urban planners, and researchers to make informed decisions regarding resource allocation, infrastructure development, and social welfare programs. The data from the 2011 census provides a comprehensive picture of the population dynamics in Kerala, which is essential for planning and development initiatives.