1978

8.0

2004

7.6

1981

7.3

2002

1.0

1999

7.8

2003

8.5

1992

7.7

1993

6.9

1964

7.4

1971

7.8

1988

5.6

1966

6.1

2000

7.7

2004

10.0

1962

6.9

1974

5.8

1985

6.8

2004

7.3

1981

5.5

2005

4.0