2004

6.4

1990

6.7

1996

6.0

1981

7.3

2006

6.1

2006

6.7

2004

5.9

2018

4.5

1993

6.6

2000

8.0

2013

6.7

2005

5.9

1996

6.1

2003

6.8

1962

7.6

1997

6.4

2007

6.7

2007

5.8

2008

6.7

1993

6.9