1951

8.6

1985

2.5

1985

6.2

1990

7.4

1998

7.0

1996

4.0

1991

6.5

1988

4.3

1992

6.7

1990

6.9

1948

5.0

1992

6.9

1976

4.6

1919

0.0

1999

7.9

1990

6.8