what was the maximum percent increase of spy from september 1999 to september 2000

SPY returned 9.4% between September 1, 1999 and September 30, 2000.

DATEOPENHIGHLOWCLOSEVOLUME
September 29 2000
$92.32
$92.63
$91.15
$91.15
8,311,700
September 28 2000
$90.87
$92.86
$90.68
$92.73
6,842,800
September 27 2000
$91.11
$91.36
$90.19
$90.85
6,049,300
September 26 2000
$91.62
$92.02
$90.37
$90.37
5,281,200
September 25 2000
$92.61
$92.69
$91.21
$91.48
9,715,400
September 22 2000
$90.51
$92.22
$90.38
$92.20
7,587,400
September 21 2000
$91.68
$92.38
$91.23
$92.14
5,346,600
September 20 2000
$92.45
$92.67
$90.85
$91.95
6,498,500
September 19 2000
$92.10
$92.85
$91.83
$92.63
6,547,800
September 18 2000
$92.89
$93.27
$91.51
$91.80
5,104,300
September 15 2000
$94.04
$94.08
$92.67
$92.71
4,075,700
September 14 2000
$94.87
$94.91
$93.78
$93.98
3,391,400
September 13 2000
$93.68
$94.54
$93.47
$94.25
4,555,100
September 12 2000
$94.79
$95.11
$93.96
$93.98
4,742,500
September 11 2000
$94.79
$95.70
$94.12
$94.69
3,933,800
September 08 2000
$95.13
$95.27
$94.53
$94.83
3,476,100
September 07 2000
$95.11
$95.63
$94.84
$95.49
4,078,800
September 06 2000
$95.70
$96.08
$94.65
$94.81
4,164,100
September 05 2000
$96.14
$96.35
$95.47
$95.76
3,450,400
September 01 2000
$97.01
$97.23
$96.22
$96.45
3,152,900
August 31 2000
$95.62
$96.91
$95.52
$96.43
4,820,800
August 30 2000
$95.78
$95.90
$95.17
$95.17
3,948,600
August 29 2000
$95.86
$96.14
$95.52
$96.09
3,528,200
August 28 2000
$95.74
$96.79
$95.74
$96.07
5,497,400
August 25 2000
$95.68
$95.98
$95.54
$95.74
2,820,400