How many years of comparable data are there for Iran, Islamic Republic of and Tonga?

14 years are reported by both, from 1999 to 2012.

Where does this data come from?

UNESCO Institute for Statistics, published as Theoretical duration of post-secondary non-tertiary education (years). Statizoid refreshes it automatically from the source and publishes the full history for both places.

Iran, Islamic Republic of vs Tonga: Theoretical duration of post-secondary non-tertiary education

Iran, Islamic Republic of

2 years

in 2012

Tonga

2 years

in 2019

Iran, Islamic Republic of rank

15th

Tonga rank

15th

Theoretical duration of post-secondary non-tertiary education over time

Iran, Islamic Republic of
Tonga

How they compare

Iran, Islamic Republic of currently reports 2 years against 2 years in Tonga, a difference of 0 years.

The two have swapped places 1 time across 14 shared years of data; in 1999 it was Iran, Islamic Republic of ahead.

Iran, Islamic Republic of ranks 15th and Tonga ranks 15th of 168 countries.

Iran, Islamic Republic of has averaged higher in every one of the 3 decades both report.

Head to head by decade

Decade	Iran, Islamic Republic of	Tonga	Difference	Ahead
1990s	2 years	1 years	1 years	Iran, Islamic Republic of
2000s	2 years	1 years	1 years	Iran, Islamic Republic of
2010s	2 years	1.33 years	0.6667 years	Iran, Islamic Republic of

Averages of every year both report within each decade.

Frequently asked questions

Which has higher theoretical duration of post-secondary non-tertiary education, Iran, Islamic Republic of or Tonga?: Iran, Islamic Republic of, at 2 years against 2 years in Tonga as of 2012.
What is the difference in theoretical duration of post-secondary non-tertiary education between Iran, Islamic Republic of and Tonga?: 0 years, with Iran, Islamic Republic of ahead.
How many years of comparable data are there for Iran, Islamic Republic of and Tonga?: 14 years are reported by both, from 1999 to 2012.
How do Iran, Islamic Republic of and Tonga rank globally for theoretical duration of post-secondary non-tertiary education?: Iran, Islamic Republic of ranks 15th and Tonga ranks 15th of 168 countries.
Where does this data come from?: UNESCO Institute for Statistics, published as Theoretical duration of post-secondary non-tertiary education (years). Statizoid refreshes it automatically from the source and publishes the full history for both places.

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Iran, Islamic Republic of vs Tonga: Theoretical duration of post-secondary non-tertiary education. Statizoid, drawing on UNESCO Institute for Statistics. Retrieved 31 August 2026, from https://education.statizoid.com/compare/theoretical-duration-of-post-secondary-non-tertiary-education-years/iran-islamic-rep/tonga/

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<a href="https://education.statizoid.com/compare/theoretical-duration-of-post-secondary-non-tertiary-education-years/iran-islamic-rep/tonga/">Iran, Islamic Republic of vs Tonga: Theoretical duration of post-secondary non-tertiary education</a> — Statizoid

About this data

Indicator: Theoretical duration of post-secondary non-tertiary education (years)
Unit: years
Source: UNESCO Institute for Statistics
Licence: CC BY 4.0 (World Bank Open Data)
Coverage: 168 places, 3,181 data points, 1970–2020
Last refreshed: 21 August 2026

Number of grades (years) in post-secondary education.