1967

6.7

2012

5.1

1969

6.6

1968

6.9

2005

5.9

2004

6.0

1989

6.3

1971

7.1

1962

7.6

1993

7.4

1994

6.4

1995

6.8

1957

8.0

2012

4.7

2008

4.5

1997

6.0

2000

6.6

1961

7.7

2001

7.1

1998

7.0