1974

7.4

1985

6.7

2018

8.2

2001

5.9

1999

7.9

2007

7.5

1992

4.7

1980

7.3

1989

8.2

1984

8.0

2020

7.0

1997

0.0

1960

3.7

2002

7.9

2006

4.0

1987

4.2

1998

0.0

1984

6.5

1967

6.6

1987

5.8