Table:
three-year average foreign share
percentage change between the three-year averages
average annual growth rate

percent

1973 to 1975
50.8
..
..

1984 to 1986
46.5
..
..

1997 to 1999
50.7
..
..

2009 to 2011
44.6
..
..

between the 1973-to-1975 and 1984-to-1986 periods
..
-8.4
-0.8

between the 1984-to-1986 and 1997-to-1999 periods
..
8.9
0.7

between the 1973-to-1975 and 1997-to-1999 periods
..
-0.2
0.0

between the 1997-to-1999 and 2009-to-2011 periods
..
-12.1
-1.0

between the 1973-to-1975 and 2009-to-2011 periods
..
-12.3
-0.3

Statement: foreign control declined from 50.8% to 46.5%, a decline of 8.4%, between the 1973-to-1975 and 1984-to-1986 periods.
Question: what was the percentage change between the 1973-to-1975 and 1984-to-1986 periods?
Answer: [-8.4]