1983

5.9

1990

7.7

2004

5.5

1992

8.0

1959

6.9

2000

6.4

1997

6.1

1984

6.3

1991

0.0

1996

0.0

1954

6.8

1973

7.5

2012

5.2

2014

5.8

2001

7.8

2004

7.3

1984

5.9

2005

7.1

1992

5.3

2015

7.2