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

43 years are reported by both, from 1980 to 2023.

Where does this data come from?

World Health Organization (2019); World Health Organization (2024) – processed by Our World in Data, published as Reported versus estimated cases of polio. Statizoid refreshes it automatically from the source and publishes the full history for both places.

Bulgaria vs Sierra Leone: Reported versus estimated cases of polio

Bulgaria

0 cases

in 2023

Sierra Leone

0 cases

in 2023

Bulgaria rank

26th

Sierra Leone rank

26th

Reported versus estimated cases of polio over time

Bulgaria
Sierra Leone

How they compare

Bulgaria currently reports 0 cases against 0 cases in Sierra Leone, a difference of 0 cases.

The two have swapped places 3 times across 43 shared years of data; in 1980 it was Bulgaria ahead.

Bulgaria ranks 26th and Sierra Leone ranks 26th of 199 countries.

Sierra Leone has averaged higher in every one of the 5 decades both report.

Head to head by decade

Decade	Bulgaria	Sierra Leone	Difference	Ahead
1980s	1.9 cases	39.3 cases	37.4 cases	Sierra Leone
1990s	5.11 cases	14.33 cases	9.22 cases	Sierra Leone
2000s	0.2 cases	4.5 cases	4.3 cases	Sierra Leone
2010s	0 cases	0.1 cases	0.1 cases	Sierra Leone
2020s	0 cases	3.75 cases	3.75 cases	Sierra Leone

Averages of every year both report within each decade.

Frequently asked questions

Which has higher reported versus estimated cases of polio, Bulgaria or Sierra Leone?: Bulgaria, at 0 cases against 0 cases in Sierra Leone as of 2023.
What is the difference in reported versus estimated cases of polio between Bulgaria and Sierra Leone?: 0 cases, with Bulgaria ahead.
How many years of comparable data are there for Bulgaria and Sierra Leone?: 43 years are reported by both, from 1980 to 2023.
How do Bulgaria and Sierra Leone rank globally for reported versus estimated cases of polio?: Bulgaria ranks 26th and Sierra Leone ranks 26th of 199 countries.
Where does this data come from?: World Health Organization (2019); World Health Organization (2024) – processed by Our World in Data, published as Reported versus estimated cases of polio. Statizoid refreshes it automatically from the source and publishes the full history for both places.

Individual pages

Share, cite or embed this page

Cite this page

Bulgaria vs Sierra Leone: Reported versus estimated cases of polio. Statizoid, drawing on World Health Organization (2019); World Health Organization (2024) – processed by Our World in Data. Retrieved 31 August 2026, from https://reference.statizoid.com/compare/reported-vs-estimated-total-number-of-paralytic-polio-cases-globally/bulgaria/sierra-leone/

Embed or link this data

Paste this into a page to link back to these figures. The data itself is free to reuse under CC BY 4.0 (Our World in Data); please keep the attribution.

<a href="https://reference.statizoid.com/compare/reported-vs-estimated-total-number-of-paralytic-polio-cases-globally/bulgaria/sierra-leone/">Bulgaria vs Sierra Leone: Reported versus estimated cases of polio</a> — Statizoid

About this data

Indicator: Reported versus estimated cases of polio
Unit: cases
Source: World Health Organization (2019); World Health Organization (2024) – processed by Our World in Data
Licence: CC BY 4.0 (Our World in Data)
Coverage: 199 places, 7,608 data points, 1980–2023
Last refreshed: 28 August 2026

Sum of wild poliovirus cases and circulating vaccine derived poliovirus cases.