2000

7.4

1982

6.7

1979

8.3

1985

7.8

1993

6.9

1986

6.3

2008

6.8

2003

7.2

2006

7.5

2004

7.7

1972

8.7

1974

8.6

1990

7.4

2002

6.7

2000

6.4

1965

7.2

1994

5.4

1962

7.4

1984

6.9

1996

7.3