Per-space-group entry counts within the Crystallography Open Database's inorganic (no-carbon formula) class, by publication year, 1960-2026 (2026 partial through early August). Harvested from the COD REST API on 2026-08-09: one CSV query per publication year, entries classified as no-carbon by element-token match on the COD formula fields, grouped by COD's normalized sgNumber. 226 distinct space groups appear. Companion to the COD composition-flip dataset (019fe3d8-6612-7381-bc5b-2e66e05b836d); no-C totals agree with server-side element-filter counts to <1%. Use cases: symmetry-mix trends, high-throughput fingerprint detection, crystallographic era analysis.
| Column | Range | Mean | Filled |
|---|---|---|---|
| year | 1,960–2,026 | 2,000 | 100% |
| sg_number | 1–230 | 111.6 | 99% |
| sg_hm | 49 distinct | — | 38% |
| crystal_system | 8 distinct | — | 100% |
| n_entries | 1–278 | 9.812 | 100% |
| year_total_noc | 216–2,942 | 1,236 | 100% |
| share_of_noc | 0.00034–0.2219 | 0.008789 | 100% |
| partial_year | 0–1 | 0.008099 | 100% |