Percentages of Original Class Principal Balances and Weighted Average Lives Security Group 1 PSA Prepayment Assumption Rates Class AB Class ZA Distribution Date 0% 100% 189% 300% 500% 0% 100% 189% 300% 500% Initial Percent .................. 100 100 100 100 100 100 100 100 100 100 January 2007  .................... 99 92 87 80 68 106 106 106 106 106 January 2008  .................... 97 85 75 64 45 112 112 112 112 112 January 2009  .................... 96 78 64 50 30 118 118 118 118 118 January 2010  .................... 94 71 55 39 19 125 125 125 125 125 January 2011  .................... 93 65 47 30 11 132 132 132 132 132 January 2012  .................... 91 59 40 23 6 139 139 139 139 139 January 2013  .................... 89 53 33 17 2 147 147 147 147 147 January 2014  .................... 87 48 28 12 0 155 155 155 155 130 January 2015  .................... 85 43 23 8 0 164 164 164 164 88 January 2016  .................... 82 38 18 5 0 173 173 173 173 60 January 2017  .................... 80 33 14 2 0 183 183 183 183 40 January 2018  .................... 77 29 11 0 0 193 193 193 181 27 January 2019  .................... 74 25 7 0 0 204 204 204 142 18 January 2020  .................... 71 21 5 0 0 216 216 216 111 12 January 2021  .................... 68 18 2 0 0 228 228 228 87 8 January 2022  .................... 64 14 0 0 0 241 241 233 67 5 January 2023  .................... 61 11 0 0 0 254 254 194 51 4 January 2024  .................... 57 7 0 0 0 269 269 159 39 2 January 2025  .................... 52 4 0 0 0 284 284 129 29 1 January 2026  .................... 48 1 0 0 0 300 300 104 22 1 January 2027  .................... 43 0 0 0 0 317 278 81 16 1 January 2028  .................... 38 0 0 0 0 334 225 62 11 0 January 2029  .................... 32 0 0 0 0 353 176 46 8 0 January 2030  .................... 26 0 0 0 0 373 130 32 5 0 January 2031  .................... 19 0 0 0 0 394 87 20 3 0 January 2032  .................... 12 0 0 0 0 417 47 10 1 0 January 2033  .................... 5 0 0 0 0 440 9 2 0 0 January 2034  .................... 0 0 0 0 0 391 0 0 0 0 January 2035  .................... 0 0 0 0 0 202 0 0 0 0 January 2036  .................... 0 0 0 0 0 0 0 0 0 0 Weighted Average Life (years)  ..................   17.9 8.4 5.6 3.8 2.3 28.9 23.6 20.0 15.6 10.2 Security Group 2 PSA Prepayment Assumption Rates Classes LA, LB and LC Class LD Class LE Distribution Date 0% 100% 187% 300% 500% 0% 100% 187% 300% 500% 0% 100% 187% 300% 500% Initial Percent .................. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 January 2007  .................... 100 100 100 100 55 100 100 100 100 100 100 100 100 100 100 January 2008  .................... 100 100 100 100 13 100 100 100 100 100 100 100 100 100 100 January 2009  .................... 100 100 100 100 0 100 100 100 100 81 100 100 100 100 100 January 2010  .................... 100 100 100 100 0 100 100 100 100 74 100 100 100 100 100 January 2011  .................... 100 100 100 100 0 100 100 100 100 74 100 100 100 100 100 January 2012  .................... 100 100 100 100 0 100 100 100 100 74 100 100 100 100 100 January 2013  .................... 100 100 100 86 0 100 100 100 100 23 100 100 100 100 100 January 2014  .................... 100 100 100 47 0 100 100 100 100 0 100 100 100 100 82 January 2015  .................... 100 100 100 16 0 100 100 100 100 0 100 100 100 100 56 January 2016  .................... 100 100 100 0 0 100 100 100 81 0 100 100 100 100 38 January 2017  .................... 100 100 73 0 0 100 100 100 41 0 100 100 100 100 26 January 2018  .................... 100 100 47 0 0 100 100 100 8 0 100 100 100 100 17 January 2019  .................... 100 100 25 0 0 100 100 100 0 0 100 100 100 84 12 January 2020  .................... 100 100 5 0 0 100 100 100 0 0 100 100 100 66 8 January 2021  .................... 100 100 0 0 0 100 100 76 0 0 100 100 100 52 5 January 2022  .................... 100 89 0 0 0 100 100 46 0 0 100 100 100 41 4 January 2023  .................... 100 67 0 0 0 100 100 20 0 0 100 100 100 32 2 January 2024  .................... 100 47 0 0 0 100 100 0 0 0 100 100 97 24 2 January 2025  .................... 100 27 0 0 0 100 100 0 0 0 100 100 81 19 1 January 2026  .................... 100 9 0 0 0 100 100 0 0 0 100 100 66 14 1 January 2027  .................... 100 0 0 0 0 100 84 0 0 0 100 100 53 10 0 January 2028  .................... 100 0 0 0 0 100 52 0 0 0 100 100 42 8 0 January 2029  .................... 100 0 0 0 0 100 22 0 0 0 100 100 33 6 0 January 2030  .................... 100 0 0 0 0 100 0 0 0 0 100 95 25 4 0 January 2031  .................... 85 0 0 0 0 100 0 0 0 0 100 72 18 3 0 January 2032  .................... 37 0 0 0 0 100 0 0 0 0 100 51 12 2 0 January 2033  .................... 0 0 0 0 0 73 0 0 0 0 100 32 7 1 0 January 2034  .................... 0 0 0 0 0 0 0 0 0 0 81 15 3 0 0 January 2035  .................... 0 0 0 0 0 0 0 0 0 0 6 1 0 0 0 January 2036  .................... 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Weighted Average Life (years)  ..................   25.7 17.9 12.0 8.0 1.2 27.2 22.1 15.9 10.8 5.8 28.4 26.2 21.9 16.2 10.1 S-15