```json { "table_name": "2018", "table_type_tags": [ {"tag": "dimension", "confidence": 0.95} ], "primary_type": "dimension", "insufficient_evidence": false, "entity": { "columns": ["Country or region"], "unique_per_row": true }, "time_axis": null, "reasoning": "Country or region is the entity with Uniqueness 1.000 (156 unique countries in 156 rows). Overall rank (also Uniqueness 1.000) orders the countries by their happiness score but is not a time axis — it's a derived attribute of the score. The table is one year's snapshot of country-level happiness metrics; sibling tables 2015–2019 suggest this is one period of a time series, but standalone this table has no time axis and each row is unique information about one country → dimension." } ```