1972

7.7

1977

7.1

2003

6.6

1997

0.0

1997

6.9

2005

6.3

2004

6.1

1932

7.4

1968

7.3

1970

7.1

1960

8.2

2002

7.0

2001

6.7

1999

5.4

1973

7.8

1987

7.2

2014

7.2

1992

6.2

2005

5.7

1965

6.3