# Global corridor exports for HS4 8544, 1995-2024

Annual bilateral merchandise exports for HS4 product group 8544 across reporting country pairs.

## What one row represents
one year, exporter, importer, and HS4 product group

## Included data
- Observed import-export measures
- Country and product identifiers
- Coverage and calculated measures where provided

## Metric notes
- USD fields are monetary values denominated in US dollars.
- Country fields use three-letter ISO 3166-1 country codes.
- HS4 identifies a four-digit Harmonized System product group.
- Growth percentages compare reported values across the relevant periods; calculated and projected fields are identified in the schema.

## Fields
- `year` — `UInt16`
- `exporter_iso3` — `FixedString(3)`
- `importer_iso3` — `FixedString(3)`
- `hs4` — `String`
- `export_value_usd` — `Float64`
- `active_hs6_count` — `UInt64`

## Coverage and size
- Coverage: 1995-2024 where reported
- Records: 316,844
- Parquet file size: 3 MB
- SHA-256: `4cddf5f18ad7d88dda8eee5079a5341d01a726b3ae896098a711cebc92e3eb52`

## Files
- `data.parquet` - complete dataset
- `manifest.json` - release metadata and checksums
- `schema.json` - field names, types, and metric notes
- `sample.json` - example records
- `README.md` - dataset documentation

## Read with Python
```python
import pandas as pd
data = pd.read_parquet("data.parquet")
print(data.head())
```

## Sources
- OECD Balanced International Merchandise Trade Statistics (BIMTS)
- OECD Terms & Conditions: https://www.oecd.org/termsandconditions/