1970

7.2

2004

5.6

1988

6.3

1998

7.3

1984

4.0

1974

5.3

1996

6.4

2006

6.3

2007

5.5

1.0

1999

1.0

1970

0.0

2003

6.2

2006

5.5

2008

5.0

2005

6.4

2013

6.7

2000

4.2

2017

2.0

2022

5.7