1995

0.0

1977

7.7

2003

7.5

2000

7.9

2007

7.1

2011

7.4

1972

7.7

1999

7.5

2005

8.1

1994

8.4

2006

4.8

2001

6.8

1997

6.6

2004

7.3

2003

9.1

1999

7.0

2007

10.0

1986

6.7

2003

8.0

1984

5.9