2003

6.0

2005

6.7

2005

7.2

2002

7.1

1987

7.3

2000

8.2

1994

8.3

2000

6.3

2001

7.8

1996

7.5

1990

7.7

1980

6.6

1982

6.4

1988

7.5

2001

6.8

2001

5.4

1974

7.8

1955

7.5

1999

7.4

1968

7.3