1949

7.7

1984

6.5

1970

6.5

1995

7.7

2004

2.9

1985

6.7

1994

6.3

2006

5.8

1990

7.6

1968

6.4

1970

6.4

1971

5.3

1982

6.0

2008

6.2

2008

5.3

1998

6.7

1991

6.8

2000

4.3