1979

7.4

1985

7.8

1972

7.7

1984

8.4

2004

9.5

2008

7.8

2013

8.7

2001

7.6

1960

7.4

1972

7.7

1990

6.9

2015

8.0

1998

7.5

2014

8.3

2015

8.0

2001

8.0

1996

7.7

1965

7.9

1976

7.0

1997

7.3