1922

7.7

2001

7.9

2002

7.7

2004

8.0

2005

7.8

2007

7.7

2004

7.5

1996

7.0

1992

7.4

1981

7.3

1992

7.3

2009

7.7

2001

6.7

1992

6.8

2002

6.7

2005

6.3

1972

7.1

1978

6.0

1987

4.1

2006

6.6