1992

7.2

1997

8.0

2001

5.4

1993

7.1

1968

6.6

1965

7.7

2008

4.0

1971

6.5

1957

8.2

2019

7.0

2000

6.2

2008

6.0

2006

5.8

1997

6.1

1978

0.0

1977

0.0

1998

7.9

1978

7.3

1998

6.0

1962

6.4