2008

6.5

1999

5.3

1998

7.1

1994

5.2

1996

5.4

1998

6.6

1991

6.8

1998

4.4

1964

3.0

2001

6.3

1993

7.0

1996

6.2

1996

6.5

1997

5.2

1997

6.3

2004

6.1

2003

6.4

2006

6.5

2000

6.4

2001

7.0