2011

3.5

2014

4.9

2013

4.2

2014

8.5

2014

6.4

2014

5.5

2015

6.0

1983

5.1

1982

7.1

2005

6.3

1976

7.2

1994

6.0

2003

6.0

1979

5.0

1992

6.2

1990

7.2

2002

7.6

1986

5.7

1980

5.0

1953

7.0