1995

7.6

1994

7.5

1994

7.2

1996

4.0

1996

8.1

1988

6.2

2006

7.8

1979

5.6

1976

7.0

1997

6.2

2003

7.8

1986

7.7

1966

7.3

2005

8.1

1993

7.0

2003

6.5

1995

6.0

1968

7.1

2004

8.3

1996

6.8