1993

5.5

2013

4.3

2012

6.1

2012

5.8

1995

3.8

1973

5.3

1999

3.4

1976

6.5

1999

4.3

2002

6.8

2005

5.8

2006

5.2

1992

6.0

2015

4.6

2005

3.7

1973

6.4

2002

5.3

1970

4.2

1976

3.3

1972

3.2