2001

7.8

2006

6.1

2006

6.0

2001

6.0

2005

5.4

1995

7.3

1992

7.0

1989

6.6

1947

5.9

1946

6.0

1969

5.9

1973

7.4

1998

5.5

2007

7.5

1984

5.9

2002

5.3

2001

6.3

1997

7.8

1978

7.1

1958

6.0