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

51 years are reported by both, from 1970 to 2020.

Where does this data come from?

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

Belgium vs Iran, Islamic Republic of: Theoretical duration of lower secondary education

Belgium

2 years

in 2020

Iran, Islamic Republic of

2 years

in 2020

Belgium rank

188th

Iran, Islamic Republic of rank

188th

Theoretical duration of lower secondary education over time

Belgium
Iran, Islamic Republic of

How they compare

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

Across all 51 years both countries report, Iran, Islamic Republic of has been ahead every year.

Belgium ranks 188th and Iran, Islamic Republic of ranks 188th of 209 countries.

Iran, Islamic Republic of has averaged higher in every one of the 6 decades both report.

Head to head by decade

Decade	Belgium	Iran, Islamic Republic of	Difference	Ahead
1970s	3 years	3 years	0 years	—
1980s	3 years	3 years	0 years	—
1990s	2.3 years	3 years	0.7 years	Iran, Islamic Republic of
2000s	2 years	3 years	1 years	Iran, Islamic Republic of
2010s	2 years	2.7 years	0.7 years	Iran, Islamic Republic of
2020s	2 years	2 years	0 years	—

Averages of every year both report within each decade.

Frequently asked questions

Which has higher theoretical duration of lower secondary education, Belgium or Iran, Islamic Republic of?: Belgium, at 2 years against 2 years in Iran, Islamic Republic of as of 2020.
What is the difference in theoretical duration of lower secondary education between Belgium and Iran, Islamic Republic of?: 0 years, with Belgium ahead.
How many years of comparable data are there for Belgium and Iran, Islamic Republic of?: 51 years are reported by both, from 1970 to 2020.
How do Belgium and Iran, Islamic Republic of rank globally for theoretical duration of lower secondary education?: Belgium ranks 188th and Iran, Islamic Republic of ranks 188th of 209 countries.
Where does this data come from?: UNESCO Institute for Statistics, published as Theoretical duration of lower secondary education (years). Statizoid refreshes it automatically from the source and publishes the full history for both places.

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Belgium vs Iran, Islamic Republic of: Theoretical duration of lower secondary education. Statizoid, drawing on UNESCO Institute for Statistics. Retrieved 02 September 2026, from https://education.statizoid.com/compare/theoretical-duration-of-lower-secondary-education-years/belgium/iran-islamic-rep/

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About this data

Indicator: Theoretical duration of lower secondary education (years)
Unit: years
Source: UNESCO Institute for Statistics
Licence: CC BY 4.0 (World Bank Open Data)
Coverage: 209 places, 10,366 data points, 1970–2020
Last refreshed: 21 August 2026

Number of grades (years) in lower secondary education.