1996

6.9

1976

7.0

2009

5.5

2008

6.0

2000

8.1

2019

5.2

2007

7.5

1976

6.6

1975

6.5

1978

7.6

1982

6.6

2005

7.0

1988

6.8

2000

6.5

1991

6.9

2007

5.1

1966

7.0

1968

6.0

1987

7.1

2002

6.2