1997

5.5

2016

7.5

2006

6.5

1974

7.5

1978

7.1

1984

7.4

1969

6.8

1980

6.4

1997

0.0

1986

5.8

1972

7.4

1986

6.2

1987

7.8

1991

7.7

1995

7.2

1966

5.5

2007

6.6

1982

5.7

1989

7.8

2001

8.3