1984

7.0

1998

7.7

1996

6.9

1999

6.8

2004

7.2

2017

6.1

1946

7.5

2003

8.2

2001

5.9

1993

8.6

1991

7.1

2006

5.9

2006

6.6

1994

7.4

1962

7.9

2006

7.2

2006

7.0

2003

7.2

2004

7.0

2006

7.4