The table shows Net National Income (Lac Crore rupees) and Per Capita Net National Income (thousand rupees) of India, 2015-16 to 2019-20.
| Year | Net National Income | Per Capita NNI |
|---|---|---|
| 2015-16 | 122 | 95 |
| 2016-17 | 136 | 105 |
| 2017-18 | 151 | 115 |
| 2018-19 | 167 | 126 |
| 2019-20 | 177 | 132 |
In which year the percentage increase in the Net National Income over the previous year was maximum?
The year-on-year rise is largest in 2016-17, where income moved from 122 to 136, so the answer is 2016-17.
That change is (136 - 122)/122 x 100, which is about 11.47%.
For 2017-18 the rise is (151 - 136)/136 x 100, about 11.02%, slightly lower.
For 2018-19 the rise is (167 - 151)/151 x 100, about 10.59%.
For 2019-20 the rise is (177 - 167)/167 x 100, only about 5.98%.
Percentage change must always be measured against the earlier base year, not the absolute rupee gap, which is why 2016-17 wins despite similar absolute jumps.
Comparing absolute increases alone would mislead, since a fixed rupee rise is a smaller percentage on a larger base.
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