1988

5.4

1989

5.6

1977

2.0

1977

5.0

2010

0.0

1988

6.2

1989

6.4

2005

6.0

1968

3.9

1972

6.2

1990

7.6

2004

2.5

2003

10.0

2003

6.0

2001

5.4

2006

0.0

2003

9.0

1999

6.5

2000

6.6

1973

6.1