1982

6.9

2007

6.2

1999

6.3

2003

6.0

1972

7.2

1979

7.3

2019

8.2

2005

6.6

1991

6.2

1996

5.9

2009

6.0

2008

5.8

1960

7.5

2009

5.4

2006

6.9

2002

4.6

2001

7.0

2001

6.2

2011

6.2

2009

7.0