1977

4.7

2003

6.9

1994

7.3

2021

3.0

2005

6.4

1987

6.7

2005

6.2

1985

8.3

2004

7.4

1995

6.7

2013

0.0

2016

6.6

0.0

1959

7.0

1985

7.2

1996

6.1

2008

6.8

1993

7.1

2002

6.5

2006

7.4