2007

7.4

2000

6.3

1970

7.6

1967

5.6

2005

4.6

1984

7.2

1991

5.3

1980

6.8

2011

3.6

2009

4.6

7.3

1988

6.8

1972

5.9

2001

4.3

1943

6.9

2006

6.3

1968

6.8

2018

7.5

1947

7.0