Year

T = 0

T = 1

T = 2

T = 3

T = 4

T = 5

T = 6

T = 7

T = 8

T = 9

T = 10

the ratio of total national revenue to the total national cost

0.921

0.969

0.998

1.014

1.022

1.024

1.022

1.017

1.011

1.003

0.995