2004

5.4

1999

5.2

2006

1.0

2009

6.6

1987

3.6

2000

5.1

1982

6.1

2008

4.0

2005

5.0

1973

5.3

1991

4.7

1974

4.2

1975

5.1

1993

6.2

1972

4.0

1971

9.0

1996

4.7

1997

4.8

2002

5.3

2013

7.0