1988

6.3

2001

7.3

2002

6.8

2005

5.3

2003

5.9

2007

10.0

2007

10.0

1986

6.1

1996

6.5

1999

3.5

1964

7.1

1982

5.7

2007

6.5

2008

8.5

2009

6.6

1997

6.1

0.0

2016

7.2

1970

7.1

2020

6.5