1993

6.9

2007

4.9

2000

7.2

1987

7.5

1983

6.7

2011

5.5

2009

5.4

1992

7.3

2007

6.7

1953

8.0

2013

7.2

1961

6.3

2015

6.3

1995

6.8

1995

7.4

1974

5.9

1966

7.2

1932

7.5

1954

7.2

1995

6.2