1990

7.4

1989

5.1

1988

3.9

1990

3.3

1980

3.3

2005

6.8

1989

0.0

1981

4.0

1986

7.1

1985

3.7

1988

6.5

2009

5.5

1980

5.9

1979

7.0

2010

7.5

1993

8.1

1975

7.0