2018

6.1

1977

4.6

1990

5.7

2005

4.9

2006

6.6

2002

6.4

1973

5.0

2004

5.3

1972

6.2

2003

5.1

1997

3.3

2007

7.5

1973

3.4

1930

6.8

2017

5.9

2004

6.7

2010

1.8

2014

6.3

2004

7.7

2008

6.7