2000

4.8

2002

5.8

2001

7.2

1997

5.1

2001

6.0

1994

7.8

2004

4.5

1995

7.3

1996

7.2

2002

7.3

1968

7.5

1997

7.0

1995

7.6

1999

5.9

2006

6.3

1987

4.2