2002

6.4

1992

5.0

2004

3.8

1998

5.8

1977

4.1

2017

6.7

2008

6.8

1991

5.8

1989

6.0

2011

5.1

2015

4.6

2009

6.0

1994

5.3

1972

5.0

2003

0.0

1978

5.3

1978

5.8

1996

0.0

1999

7.0