How many years of comparable data are there for Bulgaria and Slovakia?

5 years are reported by both, from 2006 to 2018.

Where does this data come from?

UNESCO Institute for Statistics, published as Proportion of students at the end of lower secondary education achieving at least a minimum proficiency level in reading, adjusted native parity index (NPIA). Statizoid refreshes it automatically from the source and publishes the full history for both places.

Bulgaria vs Slovakia: Proportion of students at the end of lower secondary education

Bulgaria

0.6942 NPIA

in 2018

Slovakia

0.701 NPIA

in 2018

Bulgaria rank

36th

Slovakia rank

35th

Proportion of students at the end of lower secondary education over time

Bulgaria
Slovakia

How they compare

Slovakia currently reports 0.701 NPIA against 0.6942 NPIA in Bulgaria, a difference of 0.0068 NPIA.

Across all 5 years both countries report, Slovakia has been ahead every year.

Bulgaria ranks 36th and Slovakia ranks 35th of 44 countries.

Slovakia has averaged higher in every one of the 2 decades both report.

Head to head by decade

Decade	Bulgaria	Slovakia	Difference	Ahead
2000s	0.3927 NPIA	0.9008 NPIA	0.5081 NPIA	Slovakia
2010s	0.5341 NPIA	0.7515 NPIA	0.2174 NPIA	Slovakia

Averages of every year both report within each decade.

Frequently asked questions

Which has higher proportion of students at the end of lower secondary education, Bulgaria or Slovakia?: Slovakia, at 0.701 NPIA against 0.6942 NPIA in Bulgaria as of 2018.
What is the difference in proportion of students at the end of lower secondary education between Bulgaria and Slovakia?: 0.0068 NPIA, with Slovakia ahead.
How many years of comparable data are there for Bulgaria and Slovakia?: 5 years are reported by both, from 2006 to 2018.
How do Bulgaria and Slovakia rank globally for proportion of students at the end of lower secondary education?: Bulgaria ranks 36th and Slovakia ranks 35th of 44 countries.
Where does this data come from?: UNESCO Institute for Statistics, published as Proportion of students at the end of lower secondary education achieving at least a minimum proficiency level in reading, adjusted native parity index (NPIA). Statizoid refreshes it automatically from the source and publishes the full history for both places.

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Bulgaria vs Slovakia: Proportion of students at the end of lower secondary education. Statizoid, drawing on UNESCO Institute for Statistics. Retrieved 09 September 2026, from https://reference.statizoid.com/compare/proportion-of-students-at-the-end-of-lower-secondary-education-achieving-at-least-a-25/bulgaria/slovak-republic/

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About this data

Indicator: Proportion of students at the end of lower secondary education achieving at least a minimum proficiency level in reading, adjusted native parity index (NPIA)
Unit: NPIA
Source: UNESCO Institute for Statistics
Licence: CC BY 4.0 (World Bank Open Data)
Coverage: 44 places, 280 data points, 2000–2018
Last refreshed: 04 September 2026

The Adjusted Native Parity Index (NPIA) is calculated by dividing the immigrant value for the indicator by the non-immigrant value for the indicator. If the resulting value exceeds 1, the ratio is inverted and subtracted from 2. The adjusted native parity index is symmetrical around 1 and lies in the range 0-2. An adjusted NPI equal to 1 indicates parity between immigrants and non-immigrants. In general, a value less than 1 indicates disparity in favor of non-immigrants and a value greater than 1 indicates disparity in favor of immigrants. For more information, consult the UNESCO Institute for Statistics: http://uis.unesco.org/