1983

6.8

1993

6.9

2018

5.8

1994

5.5

1981

7.4

1997

5.7

1985

7.2

2025

8.0

1988

6.3

1987

6.5

2014

2.9

1994

5.8

1999

5.0

2005

5.9

1977

6.8

1990

6.0

2004

6.7

2004

5.9

2000

6.0

2009

6.2