2002

7.6

1997

6.7

1998

8.3

1959

7.8

1999

6.9

7.0

1974

7.9

1985

7.7

2006

6.6

2014

4.7

2007

7.5

1998

7.2

2003

7.2

1994

7.4

1932

6.9

1995

6.9

1966

8.0

2002

7.2

2006

7.5

1999

7.4