1988

7.5

2012

9.7

2006

5.6

2000

7.2

1998

6.6

2001

6.0

2007

5.6

2010

6.4

1999

6.8

2016

7.4

1953

5.4

2012

5.5

2014

7.5

2006

6.6

1946

7.8

1984

6.8

2002

6.4

2003

6.3

1989

6.7

1992

5.8