1993

6.2

1988

5.4

1980

2.0

2000

5.7

1983

6.6

1989

4.5

1985

3.8

2012

2.3

2009

6.6

1976

5.0

1980

7.5

2014

6.3

1977

2.5

2008

4.0

1973

3.7

1975

5.8

1978

4.0

2013

4.8

1991

4.7

2022

6.4