1990

7.4

2024

9.9

1983

7.9

1976

6.6

2015

7.4

2011

7.1

1994

8.5

1984

5.4

2007

6.0

2003

5.8

1967

6.6

2009

6.8

2006

5.1

2008

8.5

1941

7.1

2002

7.7

1985

6.2

2001

6.7

2014

5.6

2005

6.0