时期

买入价

卖出价

收盘价

Mar-15

$58.50

$59.00

$58.75

Apr-15

$57.00

$57.50

$57.25

Q215

$56.25

$56.75

$56.50

Q315

$55.00

$55.50

$55.25

Q415

$54.00

$54.50

$54.25

Q116

$53.53

$54.03

$53.78

Cal16

$53.43

$53.93

$53.68

Cal17

$53.83

$54.33

$54.08