2000

4.5

2017

7.5

2021

7.0

2006

5.2

1978

6.3

1991

6.2

1984

6.1

1994

5.2

1996

5.4

1983

6.2

2008

6.8

1998

7.1

1982

6.8

2008

6.2

1998

6.4

1972

7.4

1995

6.3

2005

4.3

1992

5.3

1984

6.3