1973

7.1

2005

6.9

2006

7.8

2017

7.0

1987

6.1

2007

0.0

1995

7.6

1963

7.9

1924

7.8

1987

7.7

2015

5.1

2009

6.6

1984

4.8

1996

8.0

2001

4.3

1974

6.7

1965

8.1

2005

7.5

2007

6.1

1929

6.7