1996

6.0

1993

7.9

1953

4.0

2008

6.2

1992

6.5

1982

6.8

2007

6.4

2006

6.8

2014

6.0

2003

6.7

1987

7.2

2007

6.6

2015

6.8

2003

6.9

1985

6.7

2003

8.1

1975

6.5

2016

0.0

1978

6.2

2014

6.0