0.0

2005

4.0

1994

7.5

1986

6.1

2002

6.8

2007

10.0

2007

10.0

2003

5.9

1997

6.1

2009

6.6

1988

6.3

1982

5.7

1999

3.5

2007

6.5

2008

8.5

1970

7.1

1964

7.1

2005

5.3

1996

6.5

2016

7.2