1999

5.3

2002

7.0

2000

5.8

2006

6.3

1997

7.5

2004

5.8

1982

5.2

1988

6.6

1993

6.7

2005

5.7

2006

5.9

1940

6.5

2014

0.0

1982

6.0

1994

7.1

1972

7.0

2002

6.1

2008

5.8

1987

4.5

1986

5.3