1998

6.8

2005

6.5

1977

5.6

2003

5.8

1997

5.9

2015

6.2

2000

6.5

1989

5.4

2002

3.4

1983

6.7

2008

6.7

1996

6.3

2000

3.4

2006

6.3

2004

0.0

1985

6.6

1997

6.2

1961

6.8

2004

6.0

1977

6.0