>>> from pensions import exp_averag_sup

>>> l = [['1111A', 68, 640, 589, 573],
...     ['2222D', 69, 710, 550, 570, 698, 645, 512],
...     ['3333J', 72, 730, 734],
...     ['4444N', 75, 770, 645, 630, 650, 590, 481, 602]]
>>> exp_averag_sup(l, 455.5)
['1111A', 68]
>>> exp_averag_sup(l, 700.5)
['3333J', 72]
>>> exp_averag_sup(l, 1000)
[]