2004

5.5

2005

6.3

1999

5.3

1995

4.1

2008

5.9

1998

1.5

1974

4.5

1993

6.2

1979

2.0

1977

5.0

1992

4.6

2000

5.1

1989

3.7

2017

4.7

2002

6.0

2005

3.6

1993

5.5

1973

4.5

2000

3.2

1980

5.4