1992

6.0

2000

5.3

1976

6.6

1983

7.3

1964

7.1

1996

6.4

2004

1.0

2007

6.4

2016

6.7

1980

6.4

1992

0.0

1975

5.6

2005

5.9

1969

0.0

2001

7.3

1988

6.3

2000

6.3

1986

6.6

1999

6.5

1988

7.1