2004

6.0

2001

6.8

2002

6.6

1998

4.4

1998

6.4

1996

6.2

1965

5.9

1975

7.3

1995

6.5

2017

6.0

2015

5.7

1963

6.6

2006

6.3

1978

6.8

1990

5.9

2007

6.7

2008

7.0

2014

0.0

1985

6.7

1988

6.2