1946

6.6

1984

6.9

1990

7.0

1960

7.3

1988

6.3

1985

5.7

2008

3.4

2005

0.0

1964

5.8

1938

4.0

2007

0.0

2015

0.0

1955

7.2

2005

6.9

2007

6.1

2000

6.7

2003

5.5

2002

5.5

2002

7.2

1990

7.3