1989

7.0

1964

6.7

1999

7.6

1959

7.1

1999

6.5

1980

3.1

2006

5.8

2006

5.1

2001

5.6

1978

6.5

2004

6.7

1994

6.4

2001

5.1

2003

6.1

1986

6.9

1993

7.3

1995

7.3

1997

6.2

1981

6.3

1983

6.6