1988

7.3

1987

6.6

2005

6.4

1996

5.5

1981

6.5

2008

5.3

2017

7.2

1976

6.6

2003

6.9

2001

5.3

2000

5.7

2012

6.8

2009

5.9

1942

6.9

2009

6.0

1956

0.0

1982

4.8

1986

7.8

1953

5.9

1965

3.8