1973

6.8

2015

4.2

2002

5.5

2005

6.8

1970

5.0

1959

8.0

1961

7.3

1929

6.0

1980

6.2

1970

6.4

2006

6.6

2003

5.1

2009

7.1

2014

10.0

2010

3.5

2007

6.9

1986

7.0

1995

7.4

2010

6.5

1921

0.0