1997

5.3

1993

7.0

1990

6.0

1970

0.0

1985

2.0

2021

6.8

2014

5.9

2007

6.5

2016

6.4

2004

5.6

2005

5.0

1990

5.9

2013

6.4

1966

0.0

1965

0.0

1999

4.3

2004

6.8

1995

6.0

0.0

2016

6.4