1973

0.0

1993

3.5

1998

6.0

2006

5.3

2004

5.5

2000

3.8

1981

7.2

2008

1.0

1985

4.1

1988

6.6

2008

6.2

2017

6.7

1999

7.6

1959

7.7

1997

0.0

2005

5.1

2014

9.0

2006

6.2

2014

7.8

2001

7.0