2009

5.4

2000

5.8

2005

7.1

2006

6.6

1932

5.9

1988

4.2

2008

6.2

1987

6.2

2004

5.4

2001

6.4

1983

5.5

1991

5.3

1983

5.7

2008

5.3

1960

6.4

1984

6.3

1998

6.7

2003

6.2

1999

6.2

2017

5.5