1997

7.6

1979

8.2

2019

6.1

1998

6.4

1983

7.4

1979

5.8

1997

6.5

1992

6.4

2007

7.0

1972

7.8

1974

5.9

1968

8.1

2000

6.0

2002

5.9

2001

6.2

2001

5.4

1986

8.0

1987

6.8

2004

6.5

1999

5.6