1998

0.0

2001

7.8

2005

6.9

2015

2.0

1985

7.7

2006

6.6

2007

6.5

2014

6.1

1967

5.4

2006

7.1

2017

6.7

1976

9.0

1990

2.5

2017

4.8

2006

7.0

2002

7.0

2001

7.4

1938

0.0

2007

7.0

2015

0.0