2001

6.2

2003

7.8

2002

7.3

2001

6.7

2003

7.4

2002

6.6

1980

6.6

2002

7.2

1982

6.4

1988

7.5

2001

6.8

2001

5.4

1974

7.8

1955

7.5

1999

7.4

1994

6.8

1994

7.1

1990

7.4

1968

7.3

1962

7.2