1960

6.2

2007

6.8

1961

6.0

1954

7.5

2001

6.0

2005

7.0

1972

7.1

2003

7.8

1947

6.4

2001

6.2

2001

7.4

1962

8.0

1987

8.1

1992

6.7

1969

7.1

1953

7.7

1971

6.4

2014

6.6

2016

0.0

2004

5.6