Security Groups 4 and 12
PSA Prepayment Assumption Rates
Class IW
Distribution Date
0%
75%
150%
250%
400%
Initial Percent .................. 100
100
100
100
100
May 2005 ..........................
98
95
93
93
93
May 2006 ..........................
96
88
82
82
82
May 2007 ..........................
94
80
67
67
61
May 2008 ..........................
92
68
50
50
41
May 2009 ..........................
89
56
38
38
29
May 2010 ..........................
86
47
30
29
20
May 2011 ..........................
84
41
22
21
13
May 2012 ..........................
80
35
15
15
8
May 2013 ..........................
74
29
10
10
4
May 2014 ..........................
68
24
6
6
1
May 2015 ..........................
62
18
2
2
0
May 2016 ..........................
56
13
0
0
0
May 2017 ..........................
49
8
0
0
0
May 2018 ..........................
45
3
0
0
0
May 2019 ..........................
40
0
0
0
0
May 2020 ..........................
36
0
0
0
0
May 2021 ..........................
31
0
0
0
0
May 2022 ..........................
25
0
0
0
0
May 2023 ..........................
20
0
0
0
0
May 2024 ..........................
14
0
0
0
0
May 2025 ..........................
7
0
0
0
0
May 2026 ..........................
0
0
0
0
0
May 2027 ..........................
0
0
0
0
0
May 2028 ..........................
0
0
0
0
0
May 2029 ..........................
0
0
0
0
0
May 2030 ..........................
0
0
0
0
0
May 2031 ..........................
0
0
0
0
0
May 2032 ..........................
0
0
0
0
0
May 2033 ..........................
0
0
0
0
0
May 2034 ..........................
0
0
0
0
0
Weighted Average
Life (years) .................. 13.0
6.5
4.7
4.6
4.0
Security Group 5
PSA Prepayment Assumption Rates
Classes EC, FB, QA, QB, QC, QD, QE, UC and UD
Class ZC
Distribution Date
0%
100%
225%
350%
500%
0%
100%
225%
350%
500%
Initial Percent .................. 100
100
100
100
100
100
100
100
100
100
May 2005 ..........................
98
96
94
94
94
106
106
93
58
17
May 2006 ..........................
96
89
83
82
72
113
113
81
0
0
May 2007 ..........................
94
81
71
64
50
120
120
68
0
0
May 2008 ..........................
92
74
60
50
34
127
127
60
0
0
May 2009 ..........................
90
67
51
39
24
135
135
55
0
0
May 2010 ..........................
87
60
43
30
16
143
143
52
0
0
May 2011 ..........................
85
53
36
23
11
152
152
50
0
0
May 2012 ..........................
82
47
30
18
8
161
161
49
0
0
May 2013 ..........................
79
41
25
14
5
171
171
47
0
0
May 2014 ..........................
76
36
20
11
4
182
182
44
0
0
May 2015 ..........................
73
30
17
8
2
193
193
41
0
0
May 2016 ..........................
69
25
14
6
2
205
205
37
0
0
May 2017 ..........................
65
20
11
5
1
218
218
34
0
0
May 2018 ..........................
61
15
9
4
1
231
231
30
0
0
May 2019 ..........................
57
10
8
3
1
245
245
27
0
0
May 2020 ..........................
52
6
6
2
0
261
255
24
0
0
May 2021 ..........................
48
5
5
2
0
277
234
20
0
0
May 2022 ..........................
42
4
4
1
0
294
213
18
0
0
May 2023 ..........................
37
3
3
1
0
312
192
15
0
0
May 2024 ..........................
31
3
3
1
0
331
171
13
0
0
May 2025 ..........................
25
2
2
0
0
351
150
11
0
0
May 2026 ..........................
18
2
2
0
0
373
130
9
0
0
May 2027 ..........................
11
1
1
0
0
396
110
7
0
0
May 2028 ..........................
3
1
1
0
0
421
91
5
0
0
May 2029 ..........................
1
1
1
0
0
384
73
4
0
0
May 2030 ..........................
0
0
0
0
0
318
55
3
0
0
May 2031 ..........................
0
0
0
0
0
247
38
2
0
0
May 2032 ..........................
0
0
0
0
0
170
22
1
0
0
May 2033 ..........................
0
0
0
0
0
88
6
0
0
0
May 2034 ..........................
0
0
0
0
0
0
0
0
0
0
Weighted Average
Life (years) .................. 15.2
8.2
6.5
5.1
3.7
27.4
22.2
9.5
1.1
0.7
S-29