2005

7.7

1995

5.9

2015

7.5

2017

0.0

2007

7.9

1998

7.2

1970

5.0

1964

7.4

1987

8.1

2001

6.9

2013

5.3

2014

6.8

1977

0.0

1975

7.5

2004

5.7

1936

6.4

1960

8.0

1959

7.2

2002

6.7

2004

6.1