2014

4.7

1975

4.0

1999

7.1

1992

7.4

1999

6.8

1985

7.7

1993

5.7

2003

8.2

1990

6.5

2003

7.2

2006

6.6

2004

6.3

1989

6.0

1997

6.5

1975

5.2

2014

5.8

2007

5.6

2005

7.2

2001

7.5

1979

6.0