2008

6.2

1979

3.7

2002

7.0

2009

6.4

1994

5.2

2003

4.8

1984

7.7

1982

6.7

1999

4.1

1992

7.3

2002

5.5

1999

4.5

1986

5.7

2009

3.6

2005

5.6

1997

5.0

1999

3.1

1983

10.0

1993

6.8

1968

6.4

1999

3.0

1987

8.0

1997

4.4

1987

7.8

1994

7.0

2007

6.1