0.0

1960

6.3

2015

5.7

2002

6.6

1970

6.0

1976

5.6

1998

7.5

2004

7.2

2007

4.0

1957

8.2

2004

7.1

1988

6.0

2001

5.0

1989

6.0

2001

5.1

1997

6.9

1979

6.4

1977

6.2

2024

7.7

2000

6.1