1994

3.2

2001

3.9

1990

3.6

1997

6.5

1981

6.4

2004

5.5

1979

5.3

1982

1.7

1992

1.0

1980

6.4

1999

6.0

2001

6.5

2023

4.6

2005

3.6

2005

5.5

1930

4.1

1988

5.4

1975

1.0

2001

6.2

2014

5.2