1995

7.7

1994

7.5

1992

6.5

1994

7.3

1996

4.0

2006

7.8

1985

6.0

1979

5.6

2003

7.8

1997

7.6

1984

6.6

1996

6.8

1964

6.3

2002

9.1

1993

7.0

1999

6.4

1988

6.9

2002

7.5

2005

6.7

2003

7.4