2005

6.3

2000

6.9

1975

6.8

2001

6.8

1959

6.2

1995

7.0

1984

6.7

2001

7.3

2003

5.9

2016

10.0

1998

7.6

1983

6.6

2016

5.8

2018

1.0

1960

4.0

2013

7.5

2006

6.5

2008

6.8

1981

7.3

1996

6.9