this table displays the results of source of value-added growth period, 1981 to 2000, 2000 to 2008 and 1981 to 2009, calculated using percent and percentage points units of measure (appearing as column headers)
Table:
period

1981 to 2000
2000 to 2008
1981 to 2009

percent

value-added growth (log), annual average
3.22
0.39
2.31

percentage points

contribution

labour input
0.08
0.84
0.32

produced capital input
2.45
4.64
3.16

natural capital input
0.43
0.16
0.34

multifactor productiivty
0.26
-5.25
-1.51

percent

multifactor productivity growth (log), annual average before adding natural capital
-0.04
-6.96
-2.27

Respond the following question with the most concise answer possible from the table. Answers must be within a JSON object e.g. {"answer": ["YOUR ANSWER"]}. List multiple answers with commas inside the list object. 'this table displays the results of source of value-added growth period, 1981 to 2000, 2000 to 2008 and 1981 to 2009, calculated using percent and percentage points units of measure (appearing as column headers)' is the caption of the table. Please answer the question according to the table: From 1981 to 2009,what's the percentage of the log growth of value-added in oil and gas extraction per year?

{"answer": ["-2.27"]}