average sector output (nominal), average foreign-controlled market shares (nominal), and percentage change in foreign control, by sector
Table:
sector
average sector output share
average foreign-controlled market share
percentage change in foreign control

1973 to 1975
1997 to 1999
2009 to 2011
1973 to 1975
1997 to 1999
2009 to 2011
between the 1973-to-1975 and 1997-to-1999 periods
between the 1997-to-1999 and 2009-to-2011 periods
between the 1973-to-1975 and 2009-to-2011 periods

percent

food, beverage and tobacco
19.6
13.7
17.7
35.8
46.7
32.8
30.5
-29.9
-8.5

natural-resources-based
15.5
14.7
26.3
57.9
40.8
48.4
-29.5
18.7
-16.3

labour-intensive
14.4
10.1
8.8
34.6
29.6
21.4
-14.4
-27.7
-38.1

scale-based
34.8
41.8
29.1
57.0
61.1
58.0
7.2
-5.2
1.6

product-differentiated
8.6
9.7
9.0
56.2
47.9
34.0
-14.7
-29.0
-39.5

science-based
7.0
10.0
9.1
72.6
50.8
46.6
-30.0
-8.2
-35.8

manufacturing
100.0
100.0
100.0
50.8
50.7
44.6
-0.2
-12.1
-12.3

Give a precise answer to the following question using only the table information. Use the JSON format {"answer": ["YOUR ANSWER"]}. When several items apply, list them comma-separated. Table caption: 'average sector output (nominal), average foreign-controlled market shares (nominal), and percentage change in foreign control, by sector'. Please answer the question according to the table: What was the percentage change in foreign control in the product-differentiated sector between the 1997-to-1999 and 2009-to-2011 periods?

{"answer": ["-29.0"]}