Chart Improvements — Read the Story Behind Japan Energy Imports ¥25.4T

The analysis charts received a major upgrade. To show what's new, we walk through mineral-fuel imports (HS 27) with the improved chart UI.

What changed

• Full-screen mode — expand any chart; useful for 3-year × 12-month monthly series
• Faster tooltips — sub-second hover even with many series
• Log Y-axis option — toggle linear / log; essential for series that span orders of magnitude (energy is the textbook case)
• Sticky / collapsible legend — when splitting HS 27 by country you can get 30+ series; the legend stays usable
• No-overlap labels — horizontal bar charts no longer truncate long country names or HS code descriptions

Worked example: HS 27 mineral fuels shrinking

Year	HS 27 imports	YoY
2022	¥33.6T	+43% (crude shock + weak yen)
2023	¥27.3T	-19%
2024	¥25.4T	-7%

That's ¥8.2T less than the 2022 peak — roughly the size of Japan's entire 2024 pharmaceutical (HS 30) import bill.

Reproduce this in Kouro

1. Open the analysis page
2. HS = 27, trade type = Import, period = 2022-01 to 2024-12
3. Trend view, log Y-axis (seasonality stands out)
4. Switch to treemap with the same filters — 2024 top sources: Saudi Arabia, UAE, Australia

At the granular level, naphtha (HS 271012190) remains the structurally significant petrochemical feedstock import.

Related

• HS 27 mineral fuels
• Naphtha topic page
• Analysis page