1997

6.9

2002

6.2

1997

6.8

1988

7.1

2003

6.0

1962

7.3

2007

6.3

2005

6.2

1995

6.9

1998

7.4

1973

6.9

1997

6.0

2006

6.8

2005

6.4

2003

6.6

2003

4.8

1984

5.6

1954

6.3

2013

1.7

1974

6.4