2003

5.0

2004

6.6

1994

3.2

1976

2.6

2000

3.0

1992

5.7

2007

7.2

2001

6.6

2002

5.3

2004

6.7

2002

4.8

2006

7.1

1999

7.8

2003

7.2

2001

6.7

2006

6.3

1987

7.3

1988

5.0

1999

6.8

1998

6.6