1981

5.2

1997

4.5

2018

5.5

2001

0.0

1997

5.4

1993

0.0

2005

5.3

2002

6.5

2012

5.9

1999

6.8

1994

7.1

1970

6.2

1995

0.0

1999

5.5

1995

0.0

2015

5.4

1995

4.6

2005

4.6