2006

5.9

1984

6.0

1991

5.9

1995

6.5

1990

6.7

2001

6.1

2006

5.0

1973

5.2

2008

5.4

2007

7.0

1994

5.8

1993

5.0

2018

4.1

2016

7.8

2003

5.8

2005

6.2

2005

4.8

2004

6.7

1988

7.1

1992

6.3