2012

10.0

2011

6.5

1951

7.2

1975

6.4

2000

7.0

1995

5.0

2009

6.7

1990

6.1

1980

6.2

2015

7.8

1951

7.2

2011

7.6

2001

7.4

1959

7.1

2013

6.1

2001

5.5

2010

6.0

2005

5.8

2011

5.2

1993

6.2