1993

6.3

1961

7.7

1973

7.4

1996

5.7

2000

5.5

1982

5.4

2002

5.2

1974

7.0

2006

6.2

1980

7.3

1999

5.8

1994

6.5

2020

5.4

1998

6.0

1988

6.2

2010

7.2

1974

5.7

1971

6.7

1983

6.5

1974

5.7