Question: what is the median income in the uk
[{'answer': '£ 21,000 before tax', 'provenance': [{'wikipedia_id': '14946657', 'title': 'Income in the United Kingdom', 'start_paragraph_id': 10, 'start_character': 66, 'end_paragraph_id': 10, 'end_character': 88, 'bleu_score': 1.0, 'section': 'Section::::Taxable income.\n'}]}, {'answer': '£ 18,700 after tax', 'provenance': [{'wikipedia_id': '14946657', 'title': 'Income in the United Kingdom', 'start_paragraph_id': 10, 'start_character': 89, 'end_paragraph_id': 10, 'end_character': 107, 'bleu_score': 1.0, 'section': 'Section::::Taxable income.\n'}]}, {'provenance': [{'wikipedia_id': '14946657', 'title': 'Income in the United Kingdom', 'start_paragraph_id': 10, 'start_character': 0, 'end_paragraph_id': 10, 'end_character': 339, 'bleu_score': 0.854450709419842, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2698926207402902807}, 'section': 'Section::::Taxable income.\n'}]}]