1995

7.6

2010

10.0

1999

7.7

1979

6.7

2019

7.9

2005

8.8

2000

6.2

2005

7.4

2006

7.1

1988

5.7

2005

5.0

1997

3.5

1993

2.0

2014

8.3

2014

7.0

1957

7.0

2006

7.8

1975

8.0

2006

0.0

1987

6.4