时期

买入价

卖出价

收盘价

Mar-15

$58.25

$58.75

$58.50

Apr-15

$57.00

$57.25

$57.13

Q215

$56.25

$56.75

$56.50

Q315

$55.25

$56.00

$55.63

Q415

$55.00

$55.50

$55.25

Q116

$54.50

$55.00

$54.75

Cal16

$54.25

$54.75

$54.50

Cal17

$54.55

$55.05

$54.80