1998

8.1

2006

7.7

2019

6.0

2005

7.0

1947

6.4

1969

7.1

1984

7.5

2019

5.9

1965

8.0

2000

6.1

2007

8.0

1983

5.9

2002

7.4

2001

7.4

2006

7.8

2003

6.3

2001

7.3

1991

7.6

1972

4.8

1992

6.8