2015

6.0

2012

6.3

1987

6.2

1993

4.9

2011

5.2

1994

4.8

2007

6.9

2009

7.4

2011

7.0

2014

5.6

1970

6.7

1989

7.0

2009

5.6

2009

6.0

1990

6.5

2005

6.7

1991

6.5

1999

4.5

2007

7.6

1994

6.1