1997

7.4

1971

8.2

1983

7.2

1986

7.8

1972

8.7

1974

8.6

2005

6.7

1996

8.0

2017

5.8

2000

6.0

1990

7.0

1999

8.5

1995

8.0

1995

6.6

2013

0.0

1959

7.8

1995

3.3

1991

8.3

1994

8.7

2003

6.5