1986

7.6

1983

7.3

1994

7.0

2020

0.0

2005

6.3

2006

6.6

1996

8.0

1987

7.1

1997

7.5

2000

8.0

2001

7.8

1999

7.0

2002

7.3

1974

5.2

1985

7.7

2001

7.8

2006

7.0

1997

6.8

1980

8.2

2009

3.9