1997

7.6

1972

6.4

1999

7.4

1983

7.3

1984

6.2

1990

7.3

1987

6.5

2001

5.8

1968

7.6

2013

7.4

2002

6.7

2004

6.4

2005

6.7

1994

3.9

1971

7.0

2008

8.1

1976

6.6

2016

7.0

2001

6.5

1996

3.3