1987

6.5

1995

8.4

1997

6.6

1999

6.3

2002

6.0

2005

6.9

1997

6.8

1968

0.0

1966

4.4

1966

5.2

2006

5.4

2002

5.4

1971

6.4

1932

7.4

2000

6.5

1968

7.2

1989

7.0

1992

6.7

1998

6.6

1975

7.8