1952

6.9

2003

6.7

2015

6.8

1996

7.9

2010

6.4

2017

7.2

2012

7.7

2009

7.4

1997

7.6

1996

7.2

2004

8.1

2017

6.8

2013

6.9

2013

5.9

1987

7.3

1995

6.9

2007

7.9

1996

7.1

1988

7.5

2007

5.9