时期

买入价

卖出价

收盘价

Mar-15

$58.50

$59.00

$58.75

Apr-15

$57.80

$58.00

$57.90

Q215

$57.00

$57.25

$57.13

Q315

$55.50

$56.25

$55.88

Q415

$54.75

$55.50

$55.13

Q116

$54.48

$54.98

$54.73

Cal16

$54.00

$54.75

$54.38

Cal17

$54.63

$55.13

$54.88