1974

7.9

1985

7.7

1996

3.9

2024

4.7

2015

5.6

1991

7.2

1996

7.4

2001

6.4

2007

6.3

1920

0.0

1987

0.0

1972

7.3

1998

7.4

1986

6.7

2005

6.7

1988

7.1

2003

8.1

2006

6.6

1997

0.0

1992

7.0