2006

5.6

2005

6.7

2001

5.9

1999

5.2

1989

7.0

1987

6.9

1994

5.3

2017

8.3

1976

4.5

2000

6.7

1999

5.4

2007

5.7

1939

7.8

2002

6.8

1993

7.0

1967

7.3

1969

6.7

1987

7.7

1960

5.4

1934

7.5