2009

5.7

1997

6.5

1987

5.5

2008

4.0

1997

6.1

1975

0.0

2017

10.0

1973

6.6

1995

5.9

1998

6.4

1994

6.7

2005

6.3

1998

6.6

1992

7.4

1990

6.5

1996

6.5

1997

5.2

1996

5.5

2002

4.3

2000

5.3