1976

6.7

2005

4.6

1999

6.9

1993

4.9

1970

7.6

1999

6.8

2002

5.8

1983

5.7

1999

6.3

1988

6.4

1950

7.6

1996

5.8

1999

6.5

2004

6.7

2001

4.3

2000

7.1

2009

4.4

1989

6.5

2002

6.4

1983

7.4