```json { "table_name": "2015", "table_type_tags": [ {"tag": "dimension", "confidence": 0.95} ], "primary_type": "dimension", "insufficient_evidence": false, "entity": { "columns": ["Country"], "unique_per_row": true }, "time_axis": null, "reasoning": "Country is the entity with Uniqueness 1.000 (158 unique values, 158 rows). Happiness Rank and Happiness Score are attributes of each country for this single year (2015). The table name itself indicates this is one period of a time series (siblings 2016-2019 exist), but standalone this table has no time axis — it is a cross-sectional snapshot of country-level happiness metrics for 2015. Each row describes one country's attributes → dimension." } ```