2018

6.7

1989

9.3

2008

5.3

1997

5.4

1987

6.2

1999

5.6

2010

7.9

2017

7.4

2002

5.2

2007

5.5

2007

7.7

2006

6.4

1999

7.6

2011

6.0

2003

5.5

1974

5.7

1948

6.1

2005

5.8

2004

6.3

2007

7.6