_id	fecha	valor
1	2026-01-01T00:00:00	26.08
2	2026-02-01T00:00:00	31.21
3	2026-03-01T00:00:00	39.53
4	2026-04-01T00:00:00	33.94
5	2026-05-01T00:00:00	
6	2026-06-01T00:00:00