1980

4.8

1979

6.4

1974

6.3

2005

5.5

2000

4.7

2008

10.0

1974

6.5

1998

5.9

1989

10.0

2008

6.5

1988

4.8

2014

5.7

1999

5.7

1984

5.6

2006

6.9

1988

7.8

2001

5.7

1981

6.9

2003

6.3

1998

6.3