1997

6.6

1964

5.6

1997

5.1

2002

5.8

1996

7.0

1997

6.8

2004

7.2

2000

7.6

1993

7.1

1994

7.8

1998

7.5

1999

5.6

2002

7.5

1997

6.5

2003

6.4

1996

1.0

1997

7.7

2005

7.2

2002

7.2