1958

7.6

2000

6.2

2003

7.1

1983

7.1

2002

6.8

2008

7.1

2001

5.9

2008

7.7

2015

6.8

1992

5.7

2015

7.5

1966

6.7

1981

7.2

1947

7.4

1988

8.4

1999

10.0

2001

4.0

2006

6.3

1937

5.3

2003

6.2