Table:
naics industry
average manufacturing industry output share
average foreign-controlled market share
change in foreign control between 1997-to-1999 and 2009-to-2011 periods

1997 to 1999
2009 to 2011
1997 to 1999
2009 to 2011

percent
percentage points
percent

textiles, leather and apparel
3.1
1.1
25.8
13.4
-12.4
-48.1

miscellaneous manufacturing
1.2
2.0
25.6
16.7
-8.9
-34.7

printing
2.2
1.7
14.3
9.5
-4.8
-33.6

food, beverage and tobacco
13.7
17.7
46.7
32.8
-14.0
-29.9

transportation equipment
24.3
16.0
81.6
60.1
-21.5
-26.3

computer and electronic products
5.3
2.9
46.2
36.0
-10.2
-22.2

non-metallic mineral products
1.9
2.4
58.9
46.0
-12.9
-21.9

fabricated metal products
5.2
5.4
25.7
20.1
-5.6
-21.8

machinery
4.4
5.3
38.1
29.8
-8.3
-21.7

plastics and rubber products
3.9
4.1
49.6
42.2
-7.4
-14.9

electrical equipment
1.8
1.7
67.0
57.1
-9.9
-14.8

petroleum, coal and chemicals
11.4
21.4
64.1
57.2
-6.9
-10.8

furniture
2.0
1.7
14.4
13.0
-1.5
-10.2

wood products
6.0
3.6
22.5
21.3
-1.2
-5.4

paper
6.7
4.6
35.9
39.9
4.0
11.0

primary metals
6.9
8.2
28.5
71.7
43.2
151.8

manufacturing
100.0
100.0
50.7
44.6
-6.1
-12.1

Statement: aggregate foreign control in manufacturing declined from 50.7% on average in the 1997-to-1999 period to 44.6% on average in the 2009-to-2011 period, or -6.1 percentage points.
Question: what was the change in foreign control in manufacturing between 1997-to-1999 and 2009-to-2011 periods?
Answer: [-6.1]