Step 1: Definition of decennial growth rate.
Decennial growth rate refers to the percentage increase in urban population over a ten-year period (from one census to the next). It is calculated using the formula:
\[
\text{Decennial Growth Rate} = \frac{\text{Population in current year} - \text{Population in previous year}}{\text{Population in previous year}} \times 100
\]
Step 2: Analysis of decennial growth rates from the table.
- 1961-1971: 38.23%
- Moderate growth rate
- Urban population increased from 78.94 million to 109.11 million
- Post-independence urbanization phase with industrial development
- 1971-1981: 46.14%
- Highest decennial growth rate in the table
- Rapid urbanization during this period
- Due to industrial expansion, Green Revolution benefits, and migration to cities
- Urban population increased to 159.46 million
- 1981-1991: 36.47%
- Decline from the previous decade's peak
- Urban population reached 217.61 million
- Growth rate still substantial but showing signs of stabilization
- 1991-2001: 31.13%
- Further decline in growth rate
- Urban population increased to 285.36 million
- Despite lower growth rate, absolute increase was significant (about 67.75 million)
- Possible reasons: economic reforms, but also growing urban congestion
Step 3: Factors influencing decennial growth rates.
- Economic factors: Industrialization, employment opportunities in cities
- Social factors: Better education, healthcare, and amenities in urban areas
- Migration: Rural-to-urban migration for better livelihood
- Natural increase: Higher birth rates in urban areas during earlier decades
- Reclassification: Villages reclassified as towns when they meet urban criteria
- Government policies: Industrial policies, urban development programs
Step 4: Trend analysis.
The decennial growth rate of urban population shows:
- An increasing trend from 1961 to 1981 (peaking at 46.14%)
- A declining trend from 1981 onwards (36.47% in 1991, 31.13% in 2001)
- Despite declining growth rates, absolute numbers continue to increase significantly
- Reflects the maturation of urbanization process and possible saturation in some metropolitan areas
Answer: The decennial growth rate of urban population represents the percentage increase in urban population over a ten-year period. From the table, it increased from 38.23% (1961-71) to a peak of 46.14% (1971-81), then declined to 36.47% (1981-91) and further to 31.13% (1991-2001). This indicates rapid urbanization in the 1970s followed by a gradual slowdown in growth rate, though absolute urban population continues to rise substantially.