1991

7.3

2006

7.5

1996

7.7

2007

6.1

1995

6.0

1996

0.0

2003

6.9

2005

6.6

1993

6.3

1994

5.8

1999

7.6

1942

6.5

2002

7.5

2004

7.3

2007

7.4

2005

6.8

1993

7.0

1973

7.5

1994

5.9

1964

7.2