1999

5.4

1961

7.2

2000

7.1

2003

6.3

1990

5.7

1991

7.0

1975

5.8

2018

8.0

2000

5.0

2001

6.8

1973

6.5

1989

6.0

1959

5.5

1988

6.1

2000

6.4

2005

6.5

1995

6.8

2005

5.5

1990

6.7

1981

7.3