Based on the table, at the end of which decade was electrical power production…

Concept

Per-person availability is a ratio: total electrical power production divided by population. Because power is in GW and population is in millions, multiplying the ratio by 1000 converts it to watts per person.

Application

1. For 1971-1981, use the 1981 row: (40 / 27) × 1000 ≈ 1481 W per person.

2. For 1981-1991, use the 1991 row: (50 / 30) × 1000 ≈ 1667 W per person.

3. For 1991-2001, use the 2001 row: (80 / 32) × 1000 = 2500 W per person.

4. For 2001-2011, use the 2011 row: (100 / 35) × 1000 ≈ 2857 W per person.

Cross-check

The four end-of-decade ratios increase from about 1481 to 1667, 2500, and 2857 W per person. The largest value occurs at the end of 2001-2011, so that decade is the result.