2007

3.1

1974

6.9

2006

6.6

1944

7.6

1999

4.8

1996

6.9

1985

7.5

2001

6.5

1995

7.2

1987

6.5

2003

6.6

1996

4.8

1994

6.7

1989

7.4

1973

6.5

1989

6.8

2015

7.1

1997

5.6

2000

5.6

2005

6.2