18. [Sensitivity to changes in the assumed health care cost rate] AMR reported that a 1% change in the assumed health care cost rate would have the following effects (in Smillions). December 31, 1999 December 31, 2000 1% 1% 1% 1% Increase Decrease Increase Decrease Service and interest cost Benefit obligation $24 $(22) 115 (105) 320 137 $(19) (131) Using this table and Exhibit 12P-7, compare the sensitivity of AMR's postretirement plan obligations to changes in the health care cost trend rate for 1999 and 2000.