Name the average for spain delegate
{'header': ['Delegate', 'Interview', 'Swimsuit', 'Evening Gown', 'Average'], 'page_title': 'Miss Universe 1978', 'section_title': 'Semifinal scores', 'caption': 'Semifinal scores', 'rows': [['USA', '8.155 (1)', '7.855 (1)', '7.482 (2)', '7.831 (1)'], ['Sweden', '7.518 (2)', '7.300 (2)', '7.355 (3)', '7.391 (2)'], ['Spain', '6.500 (5)', '6.870 (3)', '7.545 (1)', '6.972 (3)'], ['South Africa', '6.791 (3)', '6.590 (4)', '6.373 (5)', '6.685 (4)'], ['Colombia', '6.645 (4)', '6.282 (6)', '6.545 (4)', '6.491 (5)'], ['Belgium', '6.230 (6)', '6.364 (5)', '5.709 (6)', '6.101 (6)'], ['Chile', '5.703 (7)', '5.064 (7)', '4.536 (9)', '4.891 (7)'], ['Israel', '5.260 (9)', '4.280 (8)', '4.945 (7)', '4.828 (8)'], ['Mexico', '5.320 (8)', '3.260 (11)', '4.145 (10)', '4.242 (9)'], ['Ireland', '3.889 (12)', '3.800 (9)', '4.756 (8)', '4.148 (10)'], ['Peru', '4.422 (10)', '3.718 (10)', '3.573 (11)', '3.904 (11)']]}