1993

7.6

1990

7.7

1982

6.4

2002

6.7

1971

7.5

2006

6.0

2003

7.1

2004

6.8

1992

6.9

2001

6.2

2008

5.7

1938

7.0

2008

6.4

2012

10.0

1996

5.9

2007

6.3

1999

4.8

1978

7.0

2005

5.4

2022

6.5