1,0 0,0 -1,0 -2,0 -3,0 -4,0 -5,0 1 98 0 1 98 3 1 98 6 1 98 9 1 9 9 2 1 9 9 5 1 99 8 2 0 0 1 2 0 0 4 2 0 0 7 2 0 1 0 2 0 1 3 2 0 1 6 2 0 1 9 2 02 2 P r om . 1 9 8 0- 1 9 9 3