1998

6.0

2007

5.6

2002

4.5

2008

7.1

2017

7.6

1984

5.7

1997

5.3

2015

6.0

2006

9.8

2014

7.4

2018

8.1

1935

6.5

2014

6.0

2018

6.7

2012

7.7

2010

5.2

1977

6.8

1991

7.0

2009

6.2

2002

6.2