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BTC, ETH and SOL prices

Pick a country and switch indicators on: they all line up on one time axis. You can see what changed together, what came first, where official forecasts point and how far past ones missed. Under the chart: observations computed from what is on screen.

BTC: year-end priceUSD per token87,517 USD per token 2025
025k50k75k
ETH: year-end priceUSD per token2,968 USD per token 2025
01,0002,0003,000
SOL: year-end priceUSD per token124.5785 USD per token 2025
0100200
actual

Without JavaScript you see a ready view: World — BTC: year-end price, ETH: year-end price, SOL: year-end price, 2015–2025. Every country has its own page that works without JavaScript (list below); the data is in the API.

How the indicators changed

  • BTC: year-end price: 429.6772 USD per token in 2015 → 87,517 USD per token in 2025 (+87,087 USD per token).
  • ETH: year-end price: 0.9488 USD per token in 2015 → 2,968 USD per token in 2025 (+2,967 USD per token). Peak: 3,687 USD per token in 2021; the latest value is 19% lower.
  • SOL: year-end price: 1.5093 USD per token in 2020 → 124.5785 USD per token in 2025 (+123 USD per token).

How the indicators relate

  • BTC: year-end price and ETH: year-end price (2015–2025, 11 years): levels are strongly related, in the same direction (r = 0.88); year-to-year changes are related too (r = 0.77). Changes line up from year to year too, which is more than a shared trend.
  • BTC: year-end price and SOL: year-end price: too few common years with data (6) to speak of a relationship.

Moving together in time does not prove a cause: incomes, cities, education and the era itself act on many indicators at once. These observations suggest where to look, not what causes what.

Key findings

  • UN projection of 2024: in 33 of 42 countries that already report 2024–2025 data, births are below the medium variant; in 8, below the lower bound of the 95% interval.
  • Japan: 709k births in 2024 (including children of foreign nationals). Even the latest official projection (IPSS 2023, medium) expected this level only in 2042, 18 years later. An earlier projection (IPSS 2002, medium) expected it in 2045.
  • Taiwan: 108k births in 2025. Even the latest official projection (NDC 2024, medium) expected this level only in 2036, 11 years later. An earlier projection (NDC 2016, medium) expected it in 2057.
  • China: 7.92M births in 2025. Even the latest official projection (UN WPP 2024, medium) expected this level only in 2050, 25 years later. An earlier projection (UN WPP 2022, medium) expected it in 2054.
  • United States: 1.60 children per woman in 2024. The SSA 2015 projection assumed 2.04 for that year, a gap of −22%.
  • South Korea: 0.80 children per woman in 2025. Projections made before 2020 expected 1.00–1.38 for 2025, while the 2021 and 2023 projections turned out lower than reality: fertility rose slightly in 2024–2025. Errors go both ways.
  • World: 67% of people live in countries with fertility below replacement (2.1), 31% below 1.5. World population is still growing: the UN expects a peak of about 10.3B in 2084.

All forecast-vs-actual checks →

How it works

  • A source for every number. Links go to the primary publication: the statistical office, the UN, the projection archive.
  • Forecast against fact. Next to a figure: what official projections expected for it and how far reality departed.
  • Association is not cause. Moving together in time suggests where to look; the observations under the chart always say so and check a link not only in levels but also in year-to-year changes.
  • Open data. Every table is available as CSV and JSON to check, recompute and reuse.
  • For programs and AI agents. The same data through an API and an MCP server, no page scraping: how to connect.

Data as of 7 October 2026

Country pages

Each country has a page that works without JavaScript: key indicators, observations, past UN and IMF forecasts against actual data, every series with source links. Countries →