1970

5.7

1944

7.6

1990

6.4

1953

7.1

1980

5.7

1972

7.9

2008

7.2

1966

6.5

2009

5.4

1975

6.4

1969

7.7

1998

7.0

1987

6.1

1995

4.6

1968

6.9

1996

6.1

1994

7.4

2002

7.4

2012

5.2

1921

6.8