1978

0.0

1995

6.5

1998

6.7

2005

6.3

1963

8.1

1993

8.6

1964

7.6

2006

6.9

1960

8.1

2004

6.3

1998

6.5

2002

6.3

1991

7.1

1984

7.2

1967

7.5

1989

7.1

1999

8.5

1993

6.2

1975

8.4

1975

7.3