1999

7.8

1954

5.9

2005

5.4

2007

7.1

2006

6.4

1985

6.1

2005

5.6

1999

6.5

2007

6.2

2017

5.5

2005

4.2

1992

6.7

1989

6.6

2009

5.7

2006

6.1

1930

3.0

1998

6.2

2002

6.5

1998

6.1

2008

6.5