2001

5.9

1991

7.1

1994

7.4

1987

7.1

1915

4.5

1964

7.5

2004

6.3

1999

7.1

1997

6.5

2000

5.7

1968

5.4

1974

7.4

1969

4.8

2003

7.2

2003

8.2

2010

1.0

2006

6.6

2004

1.0

1975

5.2

1973

5.8