2007

6.5

2013

5.1

1984

8.4

1986

5.5

2002

7.8

1997

6.2

1993

5.4

1995

6.8

1985

6.2

1985

6.7

1992

6.4

2009

7.2

1945

7.6

2010

6.3

1992

7.5

1996

5.3

1987

7.3

1991

7.4

1984

5.9

1976

6.0