2009

4.8

2004

5.8

1989

6.2

2001

5.9

2019

6.5

2006

6.0

1994

6.4

2005

5.9

2003

5.4

1999

7.0

1996

6.5

1981

6.4

1978

4.7

2008

7.5

2018

5.1

2003

4.0

2016

6.1

1997

2.5

1968

0.0

1983

4.6