Show budget type codes and the number of documents in each budget type.
SELECT budget_type_code ,  count(*) FROM Documents_with_expenses GROUP BY budget_type_code
SELECT budget_type_code ,  count(*) FROM Documents_with_expenses GROUP BY budget_type_code
[{'Budget_Type_Code': 'GV', 'count(*)': 6}, {'Budget_Type_Code': 'ORG', 'count(*)': 2}, {'Budget_Type_Code': 'SF', 'count(*)': 2}]