1998

7.7

1995

0.0

2003

6.4

1992

5.3

1985

7.2

2007

6.0

2006

6.2

1990

6.6

2005

5.7

1996

4.9

1994

6.0

2004

5.5

1978

7.4

1993

7.4

2006

6.6

2007

6.1

2005

6.8

2002

4.8

2008

6.5

2008

4.8