1989

7.2

1972

8.7

2001

7.4

1998

8.2

1979

6.9

1979

7.4

1987

7.6

2004

7.9

1977

7.1

1994

8.7

1991

7.5

2006

7.5

1975

8.0

1999

7.1

1995

4.5

1971

6.7

2017

9.0

2021

7.8

1993

7.3

2007

6.7