2007

6.4

1975

5.6

2004

1.0

1980

6.4

2005

5.9

2000

5.4

1986

6.7

1999

6.5

1988

7.1

2011

2.7

2000

6.3

1974

7.0

1992

7.1

1986

6.1

1976

6.6

2000

6.9

2014

6.3

1983

7.3

1986

6.9

2006

5.2