1999

7.4

1982

6.2

2004

6.8

2012

5.2

2007

6.7

1998

7.0

1992

5.4

1959

8.1

2005

6.6

2000

7.7

1979

7.3

2003

7.3

2006

6.9

1948

7.9

1990

7.0

2009

6.0

2002

6.0

2016

7.0

2004

6.3

1999

7.6