2004

6.8

1993

7.0

2002

6.3

2017

3.5

1961

7.7

1976

7.8

1979

7.3

1982

6.9

1985

7.1

1990

5.8

2014

7.3

1995

6.0

2002

6.0

2005

6.7

2014

5.7

1981

6.8

1996

7.0

2004

5.0

1986

6.3

2006

6.6