1996

6.8

1997

8.3

1975

8.3

2013

7.6

1993

6.5

1973

8.0

1981

8.0

1999

7.6

1964

7.5

2004

7.5

1975

7.3

1996

8.1

1995

7.8

1998

8.5

1993

6.4

2005

6.9

1999

8.4

1965

6.3

2003

7.4

1975

7.6