Cook Islands vs Sierra Leone: Theoretical duration of secondary education (years)
Cook Islands
7 years
in 2025
Sierra Leone
7 years
in 2025
Cook Islands rank
26th
Sierra Leone rank
26th
Theoretical duration of secondary education (years) over time
- Cook Islands
- Sierra Leone
How they compare
Cook Islands currently reports 7 years against 7 years in Sierra Leone, a difference of 0 years.
The two have swapped places 2 times across 56 shared years of data; in 1970 it was Sierra Leone ahead.
Cook Islands ranks 26th and Sierra Leone ranks 26th of 221 countries.
Across the 6 decades both report, Cook Islands averaged higher in 2 and Sierra Leone in 3.
Head to head by decade
| Decade | Cook Islands | Sierra Leone | Difference | Ahead |
|---|---|---|---|---|
| 1970s | 6 years | 7 years | 1 years | Sierra Leone |
| 1980s | 6 years | 7 years | 1 years | Sierra Leone |
| 1990s | 6.4 years | 6.9 years | 0.5 years | Sierra Leone |
| 2000s | 7 years | 6 years | 1 years | Cook Islands |
| 2010s | 7 years | 6.7 years | 0.3 years | Cook Islands |
| 2020s | 7 years | 7 years | 0 years | — |
Averages of every year both report within each decade.
Frequently asked questions
- Which has higher theoretical duration of secondary education, Cook Islands or Sierra Leone?
- Cook Islands, at 7 years against 7 years in Sierra Leone as of 2025.
- What is the difference in theoretical duration of secondary education between Cook Islands and Sierra Leone?
- 0 years, with Cook Islands ahead.
- How many years of comparable data are there for Cook Islands and Sierra Leone?
- 56 years are reported by both, from 1970 to 2025.
- How do Cook Islands and Sierra Leone rank globally for theoretical duration of secondary education?
- Cook Islands ranks 26th and Sierra Leone ranks 26th of 221 countries.
- Where does this data come from?
- UNESCO Institute for Statistics, published as Theoretical duration of secondary education (years). Statizoid refreshes it automatically from the source and publishes the full history for both places.
Individual pages
About this data
February 2026 Data Release