2005

5.3

2002

6.8

2003

5.9

2007

10.0

2007

10.0

1997

6.1

1986

6.1

1970

7.1

1964

7.1

1988

6.3

2007

6.5

2008

8.5

2001

7.3

2016

7.2

1982

5.7

1999

3.5

1996

6.5

2020

6.5

2009

6.6

2010

3.9