2007

7.2

2006

5.5

1956

7.1

1996

7.1

2003

6.6

1997

7.1

2004

7.3

1989

6.2

1987

6.8

2004

5.4

1981

6.5

2005

5.6

1988

7.1

1996

6.0

1956

6.7

1999

6.7

1977

7.3

1951

7.7

1998

6.9

1990

5.8