2006

7.4

2003

7.8

2007

4.2

1968

7.6

2013

6.7

1969

3.5

1988

7.1

2001

5.1

1969

6.5

1999

5.5

1960

6.1

1969

4.1

1995

4.0

1993

7.7

2002

5.5

2009

7.5

1975

5.6

1976

5.6

1997

1.8

1977

5.7