1979

7.1

1977

6.4

1982

10.0

1968

4.8

1998

7.1

1981

4.0

1978

5.6

1973

7.0

1994

5.7

1988

6.3

1975

4.7

2001

5.9

2011

6.8

1977

6.0

1993

6.6

1976

5.1

1999

8.3

2002

8.6

1979

3.0