1971

7.2

1998

6.9

2005

6.8

1989

4.8

2002

6.3

2003

6.9

1974

7.9

1985

7.8

1932

6.9

1995

7.0

1966

8.0

2002

7.2

2004

5.7

2005

6.6

1992

7.0

1966

6.6

2003

8.1

1999

7.2

2006

6.6

1969

7.5