-0.09

(No Response)

2.02

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to get -0.09 they subtracted the value for 1989 from the one for 1991

2.29-2.47=- 0.19

Then you divide it by 2 to get the average

0.18/2

=-0.09

The second part they got 2.02 by subtracting the average for a year period of 3 years which is (-0.09 x 3)

= 2.29-0.18-0.09

=2.2

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