1999

3.7

1993

5.5

1989

4.5

1985

3.8

1968

2.5

1999

3.7

1969

7.2

1970

3.5

1970

3.0

1995

0.0

2017

6.1

1991

5.7

1970

4.9

1976

4.8

2017

7.0

1998

4.0

1998

4.0

2006

5.5

1980

2.0

2012

2.3