2013

4.3

2012

6.1

2012

5.8

1993

5.5

1972

2.4

2014

6.3

2013

4.9

2001

3.9

2002

3.2

1999

3.2

1970

3.8

1989

4.2

2006

1.0

2015

4.6

2013

7.0

1975

5.3

1978

5.0

1974

4.8

1990

4.6

1970

3.0