2004

6.4

1995

7.6

2008

2.0

2008

1.5

1977

7.3

1972

5.7

1976

4.7

2002

5.6

2014

6.9

2007

6.1

1987

6.3

2006

7.8

1993

7.0

2005

6.3

2002

7.1

2017

7.0

1987

8.0

2004

7.7

2008

4.9

2009

4.6