1999

6.6

2006

6.0

1976

3.3

2002

5.5

2001

6.2

1975

4.3

2003

6.4

1990

6.7

2006

6.3

2000

3.0

1997

6.8

2005

6.7

2017

4.9

1982

1.7

2004

6.3

1992

0.0

1988

5.6

1995

6.8

2016

5.0

2005

6.2