2013

5.5

1996

6.4

1984

7.9

1981

7.9

1989

7.8

1998

6.8

1987

6.5

2002

8.4

2003

8.5

1988

7.9

2005

7.1

1995

5.4

1997

4.4

2004

6.5

2009

6.1

1989

7.2

2005

7.7

2003

6.2

2004

4.6

1999

4.5