2005

6.7

1999

7.7

1992

5.6

2005

5.0

1985

6.5

1972

6.2

1931

3.5

1997

7.0

2001

6.2

1995

5.3

1930

5.6

1934

4.9

1981

6.5

1959

8.1

2000

7.6

1998

6.9

1988

2.0

2019

6.0

1982

6.2

1966

6.5