2005

7.8

2005

7.1

1988

7.8

2002

6.7

2005

6.4

1972

7.1

1978

6.0

1987

4.1

2006

6.6

2006

6.7

2003

7.1

2003

6.7

1984

7.5

1929

7.4

1939

7.6

1987

7.1

1997

7.5

2008

8.5

2004

6.6

1990

6.3