1972

4.2

2002

6.8

2005

0.0

2006

3.5

2005

7.4

1978

7.1

1986

5.5

1970

7.7

1977

6.9

2002

6.1

2003

7.7

2002

6.7

2000

5.8

1991

7.8

1992

7.1

1986

6.3

2002

7.2

1979

6.9

1994

8.2

2004

6.3